Bài 27: Đọc và ghi file dùng luồng byte trong Java

[longvu]

ok đã tham khảo 1 số ý kiến chuyên gia và có 1 số nhận xét như sau:
return trong catch tránh được mấy lỗi ở phía sau:
vd:nullpointerexception ở hai câu lệnh close cho cái fin va fout ay
cai return trong catch
fin = new fileinputstream("e:\\in.mp3");
fout = new fileoutputstream("e:\\out.mp3");

nếu exception xảy ra mà ko có return thì code sẽ gặp giá trị num values ở fin.close(); fout.close() phía dưới.

[taomeoyb]

làm sao gửi lên giữ nguyên màu sắc của code vậy mọi người?
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/*
* to change this template, choose tools | templates
* and open the template in the editor.
*/
package javaapplication1;
 
import java.io.file;
import java.io.fileinputstream;
import java.io.filenotfoundexception;
import java.io.fileoutputstream;
import java.io.ioexception;
import java.util.scanner;
 
/**
*
* @author misskieu
*/
public class copytuconsole {
    private string inputpath;
    private string outputpath;
    private string request;
 
    scanner inp = new scanner(system.in);
 
    public void copyfile(string inputpath, string outputpath) throws ioexception{
        fileinputstream finp;
        fileoutputstream fout;
     
        try {
            finp = new fileinputstream(inputpath);
        } catch (filenotfoundexception e) {
            system.out.println("input file not found");
            return;
        }
     
        try {
            fout = new fileoutputstream(outputpath);
        } catch (filenotfoundexception e) {
            system.out.println("error opening outputfile");
            return;
        }
     
        int i;
        do {
            i = finp.read();
            if (i != -1) {
                fout.write(i);
            }
        } while (i != -1);
        finp.close();
        fout.close(); 
        system.out.println("finish copy file");
    }
 
    public void deletefile(string path){
        try {
            file file = new file(path);
            if (file.delete()) {
                system.out.println(file.getname() + " is deleted!");
            } else {
                system.out.println("delete operation is failed.");
            }
        } catch (exception e) {
            e.printstacktrace();
        }
    }
 
    public void movefile(string inputpath,string outputpath) throws ioexception{
        copyfile(inputpath, outputpath);
        deletefile(inputpath);
        system.out.println("finished move file");
    }
 
    void xulyrequest() throws ioexception{
        system.out.println("nhap yeu cau:copy, delete, move, exit?");
        request = inp.nextline();
        switch(request){
            case "copy":
                system.out.println("nhap duong dan file copy: " );
                inputpath = inp.nextline();
                system.out.println("nhap duong dan dich den: " );
                outputpath = inp.nextline();
                copyfile(inputpath, outputpath);
                xulyrequest();
                break;
            case "delete":
                system.out.println("nhap duong dan file delete: " );
                inputpath = inp.nextline();
                deletefile(inputpath);
                xulyrequest();
            case "move":
                system.out.println("nhap duong dan file copy: " );
                inputpath = inp.nextline();
                system.out.println("nhap duong dan dich den: " );
                outputpath = inp.nextline();
                copyfile(inputpath, outputpath);
                deletefile(inputpath);
                xulyrequest();
            case "exit":
                system.out.println("ban da thoat khoi chuong trinh");
                break;
            default: xulyrequest();
        }
    }
 
    public static void main(string[] args) throws ioexception {
        copytuconsole a = new copytuconsole();
        a.xulyrequest();
    }
}

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[vanthi1991]

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[color=#000000]
[/color][color=#ff8000]/** to change this license header, choose license headers in project properties.* to change this template file, choose tools | templates* and open the template in the editor.*/[/color][color=#0000bb]package javabasic[/color][color=#007700].[/color][color=#0000bb]demo[/color][color=#007700]; [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]file[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]fileinputstream[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]filenotfoundexception[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]fileoutputstream[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]ioexception[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]nio[/color][color=#007700].[/color][color=#0000bb]file[/color][color=#007700].[/color][color=#0000bb]files[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700]; [/color][color=#ff8000]/**** @author systemadmin*/[/color][color=#007700]public class [/color][color=#0000bb]baitap [/color][color=#007700]{     [/color][color=#0000bb]fileinputstream fin[/color][color=#007700];    [/color][color=#0000bb]fileoutputstream fout[/color][color=#007700];     public [/color][color=#0000bb]void copy[/color][color=#007700]([/color][color=#0000bb]string str1[/color][color=#007700], [/color][color=#0000bb]string str2[/color][color=#007700]) [/color][color=#0000bb]throws ioexception [/color][color=#007700]{        try {            try {                [/color][color=#0000bb]fin [/color][color=#007700]= new [/color][color=#0000bb]fileinputstream[/color][color=#007700]([/color][color=#0000bb]str1[/color][color=#007700]);            } catch ([/color][color=#0000bb]filenotfoundexception exc[/color][color=#007700]) {                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"file not found"[/color][color=#007700]);                return;            }             try {                [/color][color=#0000bb]fout [/color][color=#007700]= new [/color][color=#0000bb]fileoutputstream[/color][color=#007700]([/color][color=#0000bb]str2[/color][color=#007700]);            } catch ([/color][color=#0000bb]filenotfoundexception exc[/color][color=#007700]) {                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"error opening output file"[/color][color=#007700]);                return;            }        } catch ([/color][color=#0000bb]arrayindexoutofbound***ception exc[/color][color=#007700]) {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"usage: copyfile from to"[/color][color=#007700]);            return;        }         [/color][color=#0000bb]int i[/color][color=#007700];        try {            do {                [/color][color=#0000bb]i [/color][color=#007700]= [/color][color=#0000bb]fin[/color][color=#007700].[/color][color=#0000bb]read[/color][color=#007700]();                if ([/color][color=#0000bb]i [/color][color=#007700]!= -[/color][color=#0000bb]1[/color][color=#007700]) {                    [/color][color=#0000bb]fout[/color][color=#007700].[/color][color=#0000bb]write[/color][color=#007700]([/color][color=#0000bb]i[/color][color=#007700]);                }            } while ([/color][color=#0000bb]i [/color][color=#007700]!= -[/color][color=#0000bb]1[/color][color=#007700]);        } catch ([/color][color=#0000bb]ioexception exc[/color][color=#007700]) {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"file error"[/color][color=#007700]);        }        [/color][color=#0000bb]fin[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();        [/color][color=#0000bb]fout[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();    }     public [/color][color=#0000bb]void move[/color][color=#007700]([/color][color=#0000bb]string str1[/color][color=#007700], [/color][color=#0000bb]string str2[/color][color=#007700]) [/color][color=#0000bb]throws ioexception [/color][color=#007700]{        try {            try {                [/color][color=#0000bb]fin [/color][color=#007700]= new [/color][color=#0000bb]fileinputstream[/color][color=#007700]([/color][color=#0000bb]str1[/color][color=#007700]);            } catch ([/color][color=#0000bb]filenotfoundexception exc[/color][color=#007700]) {                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"file not found"[/color][color=#007700]);                return;            }             try {                [/color][color=#0000bb]fout [/color][color=#007700]= new [/color][color=#0000bb]fileoutputstream[/color][color=#007700]([/color][color=#0000bb]str2[/color][color=#007700]);            } catch ([/color][color=#0000bb]filenotfoundexception exc[/color][color=#007700]) {                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"error opening output file"[/color][color=#007700]);                return;            }        } catch ([/color][color=#0000bb]arrayindexoutofbound***ception exc[/color][color=#007700]) {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"usage: movefile from to"[/color][color=#007700]);        }         [/color][color=#0000bb]int i[/color][color=#007700];        try {            do {                [/color][color=#0000bb]i [/color][color=#007700]= [/color][color=#0000bb]fin[/color][color=#007700].[/color][color=#0000bb]read[/color][color=#007700]();                if ([/color][color=#0000bb]i [/color][color=#007700]!= -[/color][color=#0000bb]1[/color][color=#007700]) {                    [/color][color=#0000bb]fout[/color][color=#007700].[/color][color=#0000bb]write[/color][color=#007700]([/color][color=#0000bb]i[/color][color=#007700]);                }            } while ([/color][color=#0000bb]i [/color][color=#007700]!= -[/color][color=#0000bb]1[/color][color=#007700]);        } catch ([/color][color=#0000bb]ioexception exc[/color][color=#007700]) {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"file error"[/color][color=#007700]);        }        [/color][color=#0000bb]file f [/color][color=#007700]= new [/color][color=#0000bb]file[/color][color=#007700]([/color][color=#0000bb]str1[/color][color=#007700]);        [/color][color=#0000bb]fin[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();        [/color][color=#0000bb]fout[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();        [/color][color=#0000bb]f[/color][color=#007700].[/color][color=#0000bb]delete[/color][color=#007700]();    }     public [/color][color=#0000bb]void delete[/color][color=#007700]([/color][color=#0000bb]string str1[/color][color=#007700]) [/color][color=#0000bb]throws ioexception [/color][color=#007700]{        try {            [/color][color=#0000bb]fin [/color][color=#007700]= new [/color][color=#0000bb]fileinputstream[/color][color=#007700]([/color][color=#0000bb]str1[/color][color=#007700]);        } catch ([/color][color=#0000bb]filenotfoundexception exc[/color][color=#007700]) {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"file not found"[/color][color=#007700]);        }         [/color][color=#0000bb]file f [/color][color=#007700]= new [/color][color=#0000bb]file[/color][color=#007700]([/color][color=#0000bb]str1[/color][color=#007700]);        [/color][color=#0000bb]fin[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();        [/color][color=#0000bb]f[/color][color=#007700].[/color][color=#0000bb]delete[/color][color=#007700]();    }     public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) [/color][color=#0000bb]throws ioexception [/color][color=#007700]{        [/color][color=#0000bb]string cmd[/color][color=#007700];        [/color][color=#0000bb]scanner input [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]""[/color][color=#007700]);        [/color][color=#0000bb]cmd [/color][color=#007700]= [/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();         [/color][color=#0000bb]baitap a [/color][color=#007700]= new [/color][color=#0000bb]baitap[/color][color=#007700]();         [/color][color=#0000bb]string cmdarr[/color][color=#007700][] = [/color][color=#0000bb]cmd[/color][color=#007700].[/color][color=#0000bb]split[/color][color=#007700]([/color][color=#dd0000]" "[/color][color=#007700]);         switch ([/color][color=#0000bb]cmdarr[/color][color=#007700][[/color][color=#0000bb]0[/color][color=#007700]]) {            case [/color][color=#dd0000]"copy"[/color][color=#007700]:                [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]copy[/color][color=#007700]([/color][color=#0000bb]cmdarr[/color][color=#007700][[/color][color=#0000bb]1[/color][color=#007700]], [/color][color=#0000bb]cmdarr[/color][color=#007700][[/color][color=#0000bb]2[/color][color=#007700]]);                break;            case [/color][color=#dd0000]"move"[/color][color=#007700]:                [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]move[/color][color=#007700]([/color][color=#0000bb]cmdarr[/color][color=#007700][[/color][color=#0000bb]1[/color][color=#007700]], [/color][color=#0000bb]cmdarr[/color][color=#007700][[/color][color=#0000bb]2[/color][color=#007700]]);                break;            case [/color][color=#dd0000]"del"[/color][color=#007700]:                [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]delete[/color][color=#007700]([/color][color=#0000bb]cmdarr[/color][color=#007700][[/color][color=#0000bb]1[/color][color=#007700]]);                break;            default:                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"\""[/color][color=#007700]+[/color][color=#0000bb]cmdarr[/color][color=#007700][[/color][color=#0000bb]0[/color][color=#007700]]+[/color][color=#dd0000]"\""[/color][color=#007700]+[/color][color=#dd0000]" command is not found"[/color][color=#007700]);                break;        }    }}[/color] 

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[rinsawo]

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[color=#000000]
    [/color][color=#007700]public static [/color][color=#0000bb]void main [/color][color=#007700]([/color][color=#0000bb]string [/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) [/color][color=#0000bb]throws ioexception[/color][color=#007700]{               [/color][color=#0000bb]scanner input [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]string command[/color][color=#007700];               [/color][color=#0000bb]boolean havecommand [/color][color=#007700]= [/color][color=#0000bb]true[/color][color=#007700];        do {                   [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"go lenh ban muon su dung ( copy, move, delete): "[/color][color=#007700]);        [/color][color=#0000bb]command [/color][color=#007700]= ([/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]().[/color][color=#0000bb]trim[/color][color=#007700]());        [/color][color=#0000bb]havecommand [/color][color=#007700]= [/color][color=#0000bb]true[/color][color=#007700];        switch ( [/color][color=#0000bb]command[/color][color=#007700]){            case [/color][color=#dd0000]"copy"[/color][color=#007700]: [/color][color=#0000bb]copy[/color][color=#007700]();                break;            case [/color][color=#dd0000]"move"[/color][color=#007700]: [/color][color=#0000bb]move[/color][color=#007700]();                break;            case [/color][color=#dd0000]"delete"[/color][color=#007700]: [/color][color=#0000bb]delete[/color][color=#007700]();                break;                       default:                [/color][color=#0000bb]havecommand [/color][color=#007700]= [/color][color=#0000bb]false[/color][color=#007700];                break;        }        } while ( ![/color][color=#0000bb]havecommand [/color][color=#007700]);    }     public static [/color][color=#0000bb]void delete[/color][color=#007700](){        [/color][color=#0000bb]string path[/color][color=#007700];        [/color][color=#0000bb]scanner input [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]boolean havefile[/color][color=#007700];        [/color][color=#0000bb]file f[/color][color=#007700];               do {        [/color][color=#0000bb]havefile [/color][color=#007700]= [/color][color=#0000bb]true[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"go duong dan file ban muon delete: "[/color][color=#007700]);        [/color][color=#0000bb]path [/color][color=#007700]= [/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        [/color][color=#0000bb]f [/color][color=#007700]= new [/color][color=#0000bb]file[/color][color=#007700]([/color][color=#0000bb]path[/color][color=#007700]);        if ( ![/color][color=#0000bb]f[/color][color=#007700].[/color][color=#0000bb]exists[/color][color=#007700]()) {            [/color][color=#0000bb]havefile [/color][color=#007700]= [/color][color=#0000bb]false[/color][color=#007700];            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"file not found"[/color][color=#007700]);        }        }  while (![/color][color=#0000bb]havefile[/color][color=#007700]);        [/color][color=#0000bb]f[/color][color=#007700].[/color][color=#0000bb]delete[/color][color=#007700]();        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"have finished delete file"[/color][color=#007700]);    }    public static [/color][color=#0000bb]void move[/color][color=#007700]() [/color][color=#0000bb]throws ioexception [/color][color=#007700]{        [/color][color=#0000bb]boolean haveinput[/color][color=#007700];        [/color][color=#0000bb]fileinputstream fin [/color][color=#007700]= [/color][color=#0000bb]null[/color][color=#007700];        [/color][color=#0000bb]fileoutputstream fout [/color][color=#007700]= [/color][color=#0000bb]null[/color][color=#007700];               [/color][color=#0000bb]scanner input [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]string path1[/color][color=#007700], [/color][color=#0000bb]path2[/color][color=#007700];        [/color][color=#0000bb]file f[/color][color=#007700];        do {            [/color][color=#0000bb]haveinput [/color][color=#007700]= [/color][color=#0000bb]true[/color][color=#007700];            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"go duong dan file ban muon move: " [/color][color=#007700]);            [/color][color=#0000bb]path1 [/color][color=#007700]= [/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]().[/color][color=#0000bb]trim[/color][color=#007700]();            [/color][color=#0000bb]f [/color][color=#007700]= new [/color][color=#0000bb]file[/color][color=#007700]([/color][color=#0000bb]path1[/color][color=#007700]);            if ( ![/color][color=#0000bb]f[/color][color=#007700].[/color][color=#0000bb]exists[/color][color=#007700]())            {                [/color][color=#0000bb]haveinput [/color][color=#007700]= [/color][color=#0000bb]false[/color][color=#007700];                             [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"file not found"[/color][color=#007700]);            }        } while (![/color][color=#0000bb]haveinput[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"go duong dan file ban muon move den: "[/color][color=#007700]);        [/color][color=#0000bb]path2 [/color][color=#007700]= [/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]().[/color][color=#0000bb]trim[/color][color=#007700]();        try {            [/color][color=#0000bb]fin [/color][color=#007700]= new [/color][color=#0000bb]fileinputstream[/color][color=#007700]([/color][color=#0000bb]path1[/color][color=#007700]);        } catch ([/color][color=#0000bb]filenotfoundexception ex[/color][color=#007700]) {            [/color][color=#0000bb]logger[/color][color=#007700].[/color][color=#0000bb]getlogger[/color][color=#007700]([/color][color=#0000bb]fileprocess[/color][color=#007700].class.[/color][color=#0000bb]getname[/color][color=#007700]()).[/color][color=#0000bb]log[/color][color=#007700]([/color][color=#0000bb]level[/color][color=#007700].[/color][color=#0000bb]severe[/color][color=#007700], [/color][color=#0000bb]null[/color][color=#007700], [/color][color=#0000bb]ex[/color][color=#007700]);        }        try {            [/color][color=#0000bb]fout [/color][color=#007700]= new [/color][color=#0000bb]fileoutputstream[/color][color=#007700]([/color][color=#0000bb]path2[/color][color=#007700]);        } catch ([/color][color=#0000bb]filenotfoundexception ex[/color][color=#007700]) {            [/color][color=#0000bb]logger[/color][color=#007700].[/color][color=#0000bb]getlogger[/color][color=#007700]([/color][color=#0000bb]fileprocess[/color][color=#007700].class.[/color][color=#0000bb]getname[/color][color=#007700]()).[/color][color=#0000bb]log[/color][color=#007700]([/color][color=#0000bb]level[/color][color=#007700].[/color][color=#0000bb]severe[/color][color=#007700], [/color][color=#0000bb]null[/color][color=#007700], [/color][color=#0000bb]ex[/color][color=#007700]);        }        [/color][color=#0000bb]int i[/color][color=#007700];        do {            [/color][color=#0000bb]i [/color][color=#007700]= [/color][color=#0000bb]fin[/color][color=#007700].[/color][color=#0000bb]read[/color][color=#007700]();            if ( [/color][color=#0000bb]i [/color][color=#007700]!= -[/color][color=#0000bb]1[/color][color=#007700])            [/color][color=#0000bb]fout[/color][color=#007700].[/color][color=#0000bb]write[/color][color=#007700]([/color][color=#0000bb]i[/color][color=#007700]);        } while ([/color][color=#0000bb]i [/color][color=#007700]!= -[/color][color=#0000bb]1[/color][color=#007700]);               [/color][color=#0000bb]fin[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();        [/color][color=#0000bb]fout[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();        [/color][color=#0000bb]f[/color][color=#007700].[/color][color=#0000bb]delete[/color][color=#007700]();    }     public static [/color][color=#0000bb]void copy[/color][color=#007700]() [/color][color=#0000bb]throws ioexception[/color][color=#007700]{        [/color][color=#0000bb]boolean haveinput[/color][color=#007700];        [/color][color=#0000bb]fileinputstream fin [/color][color=#007700]= [/color][color=#0000bb]null[/color][color=#007700];        [/color][color=#0000bb]fileoutputstream fout [/color][color=#007700]= [/color][color=#0000bb]null[/color][color=#007700];               [/color][color=#0000bb]scanner input [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]string  path1[/color][color=#007700], [/color][color=#0000bb]path2[/color][color=#007700];        do {            [/color][color=#0000bb]haveinput [/color][color=#007700]= [/color][color=#0000bb]true[/color][color=#007700];            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"go duong dan file ban muon copy : "[/color][color=#007700]);            [/color][color=#0000bb]path1 [/color][color=#007700]= [/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]().[/color][color=#0000bb]trim[/color][color=#007700]();            [/color][color=#0000bb]file f [/color][color=#007700]= new [/color][color=#0000bb]file[/color][color=#007700]([/color][color=#0000bb]path1[/color][color=#007700]);            if ( ![/color][color=#0000bb]f[/color][color=#007700].[/color][color=#0000bb]exists[/color][color=#007700]())            {                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"file not found"[/color][color=#007700]);                [/color][color=#0000bb]haveinput [/color][color=#007700]= [/color][color=#0000bb]false[/color][color=#007700];            }                   } while (![/color][color=#0000bb]haveinput[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"go duong dan file ban muon tao ra: "[/color][color=#007700]);        [/color][color=#0000bb]path2 [/color][color=#007700]= [/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]().[/color][color=#0000bb]trim[/color][color=#007700]();        [/color][color=#0000bb]int i[/color][color=#007700];        try {            [/color][color=#0000bb]fin [/color][color=#007700]= new [/color][color=#0000bb]fileinputstream[/color][color=#007700]([/color][color=#0000bb]path1[/color][color=#007700]);        } catch ([/color][color=#0000bb]filenotfoundexception ex[/color][color=#007700]) {            [/color][color=#0000bb]logger[/color][color=#007700].[/color][color=#0000bb]getlogger[/color][color=#007700]([/color][color=#0000bb]fileprocess[/color][color=#007700].class.[/color][color=#0000bb]getname[/color][color=#007700]()).[/color][color=#0000bb]log[/color][color=#007700]([/color][color=#0000bb]level[/color][color=#007700].[/color][color=#0000bb]severe[/color][color=#007700], [/color][color=#0000bb]null[/color][color=#007700], [/color][color=#0000bb]ex[/color][color=#007700]);        }        [/color][color=#0000bb]fout [/color][color=#007700]= new [/color][color=#0000bb]fileoutputstream[/color][color=#007700]([/color][color=#0000bb]path2[/color][color=#007700]);               do {                [/color][color=#0000bb]i [/color][color=#007700]= [/color][color=#0000bb]fin[/color][color=#007700].[/color][color=#0000bb]read[/color][color=#007700]();                if ( [/color][color=#0000bb]i [/color][color=#007700]!= -[/color][color=#0000bb]1[/color][color=#007700])                [/color][color=#0000bb]fout[/color][color=#007700].[/color][color=#0000bb]write[/color][color=#007700]([/color][color=#0000bb]i[/color][color=#007700]);        } while ([/color][color=#0000bb]i [/color][color=#007700]!= -[/color][color=#0000bb]1[/color][color=#007700]);    [/color][color=#0000bb]fin[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();    [/color][color=#0000bb]fout[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();           [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"finish copy"[/color][color=#007700]);    }[/color] 

</blockquote></div>
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</div>

[bayvisao]

bai minh lam:
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[color=#000000]
package nhansu[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]file[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]filenotfoundexception[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]ioexception[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]fileinputstream[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]fileoutputstream[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700];public class [/color][color=#0000bb]luongtrongjava [/color][color=#007700]{    [/color][color=#0000bb]scanner input[/color][color=#007700]=new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);    public [/color][color=#0000bb]void copy[/color][color=#007700]([/color][color=#0000bb]string st1[/color][color=#007700],[/color][color=#0000bb]string st2[/color][color=#007700]) [/color][color=#0000bb]throws ioexception[/color][color=#007700]{        [/color][color=#0000bb]fileinputstream f1[/color][color=#007700];        [/color][color=#0000bb]fileoutputstream f2[/color][color=#007700];        [/color][color=#0000bb]int i[/color][color=#007700];        try{            [/color][color=#0000bb]f1[/color][color=#007700]= new [/color][color=#0000bb]fileinputstream[/color][color=#007700]([/color][color=#0000bb]st1[/color][color=#007700]);        }        catch([/color][color=#0000bb]filenotfoundexception exc[/color][color=#007700]){            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"file khong ton tai"[/color][color=#007700]);            return;        }        try{            [/color][color=#0000bb]f2[/color][color=#007700]=new [/color][color=#0000bb]fileoutputstream[/color][color=#007700]([/color][color=#0000bb]st2[/color][color=#007700]);        }        catch([/color][color=#0000bb]filenotfoundexception exc[/color][color=#007700]){            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"loi 1"[/color][color=#007700]);            return;        }        try{            do{                [/color][color=#0000bb]i[/color][color=#007700]=[/color][color=#0000bb]f1[/color][color=#007700].[/color][color=#0000bb]read[/color][color=#007700]();                [/color][color=#0000bb]f2[/color][color=#007700].[/color][color=#0000bb]write[/color][color=#007700]([/color][color=#0000bb]i[/color][color=#007700]);            }            while([/color][color=#0000bb]i[/color][color=#007700]!=-[/color][color=#0000bb]1[/color][color=#007700]);        }        catch([/color][color=#0000bb]ioexception exc[/color][color=#007700]){            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"loi 2"[/color][color=#007700]);        }    }    public [/color][color=#0000bb]void xulicopy[/color][color=#007700]() [/color][color=#0000bb]throws ioexception[/color][color=#007700]{             [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"file nguon:"[/color][color=#007700]);        [/color][color=#0000bb]string st2[/color][color=#007700]=[/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"file dich:"[/color][color=#007700]);        [/color][color=#0000bb]string st3[/color][color=#007700]=[/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        [/color][color=#0000bb]copy[/color][color=#007700]([/color][color=#0000bb]st2[/color][color=#007700],[/color][color=#0000bb]st3[/color][color=#007700]);    }    public [/color][color=#0000bb]void xulimove[/color][color=#007700]() [/color][color=#0000bb]throws ioexception[/color][color=#007700]{        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"thu muc chua file can move:"[/color][color=#007700]);        [/color][color=#0000bb]string st1[/color][color=#007700]=[/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"ten file:"[/color][color=#007700]);        [/color][color=#0000bb]string st2[/color][color=#007700]=[/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"ban muon chuyen file do den thu muc nao:"[/color][color=#007700]);        [/color][color=#0000bb]string st3[/color][color=#007700]=[/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        [/color][color=#0000bb]file f[/color][color=#007700]=new [/color][color=#0000bb]file[/color][color=#007700]([/color][color=#0000bb]st3[/color][color=#007700]+[/color][color=#dd0000]"\\"[/color][color=#007700]+[/color][color=#0000bb]st2[/color][color=#007700]);        [/color][color=#0000bb]f[/color][color=#007700].[/color][color=#0000bb]createnewfile[/color][color=#007700]();        [/color][color=#0000bb]copy[/color][color=#007700]([/color][color=#0000bb]st1[/color][color=#007700]+[/color][color=#dd0000]"\\"[/color][color=#007700]+[/color][color=#0000bb]st2[/color][color=#007700],[/color][color=#0000bb]st3[/color][color=#007700]+[/color][color=#dd0000]"\\"[/color][color=#007700]+[/color][color=#0000bb]st2[/color][color=#007700]);        [/color][color=#0000bb]file f2[/color][color=#007700]=new [/color][color=#0000bb]file[/color][color=#007700]([/color][color=#0000bb]st1[/color][color=#007700]+[/color][color=#dd0000]"\\"[/color][color=#007700]+[/color][color=#0000bb]st2[/color][color=#007700]);        [/color][color=#0000bb]f2[/color][color=#007700].[/color][color=#0000bb]delete[/color][color=#007700]();    }    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][][/color][color=#0000bb]args[/color][color=#007700]) [/color][color=#0000bb]throws ioexception[/color][color=#007700]{        [/color][color=#0000bb]luongtrongjava a[/color][color=#007700]=new [/color][color=#0000bb]luongtrongjava[/color][color=#007700]();        [/color][color=#0000bb]scanner input[/color][color=#007700]=new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"ban muon lam gi?(copy hay move)"[/color][color=#007700]);        [/color][color=#0000bb]string st[/color][color=#007700]=[/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();        if([/color][color=#0000bb]st[/color][color=#007700].[/color][color=#0000bb]equals[/color][color=#007700]([/color][color=#dd0000]"copy"[/color][color=#007700]))            [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]xulicopy[/color][color=#007700]();        if([/color][color=#0000bb]st[/color][color=#007700].[/color][color=#0000bb]equals[/color][color=#007700]([/color][color=#dd0000]"move"[/color][color=#007700]))            [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]xulimove[/color][color=#007700]();    }}[/color] 

</blockquote></div>
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</div>

[trinhducquyet]

bài của mình các bạn xem có góp ý gì thêm nhé. sử dụng command line như:
cp \\path1 \\path2
mv \\path1 \\path2
dl \\path1
tự tạo file để copy va mv khi không tìm thấy đường dẫn của path2

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[color=#000000]
package controlfile[/color][color=#007700]; [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]file[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]fileinputstream[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]filenotfoundexception[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]fileoutputstream[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]ioexception[/color][color=#007700]; public class [/color][color=#0000bb]filecontrol [/color][color=#007700]{    private [/color][color=#0000bb]byte [/color][color=#007700][] [/color][color=#0000bb]commandinput [/color][color=#007700]= new [/color][color=#0000bb]byte[/color][color=#007700][[/color][color=#0000bb]100[/color][color=#007700]];    private [/color][color=#0000bb]char [/color][color=#007700][] [/color][color=#0000bb]arrchar [/color][color=#007700]= new [/color][color=#0000bb]char[/color][color=#007700][[/color][color=#0000bb]100[/color][color=#007700]];    private [/color][color=#0000bb]string path1[/color][color=#007700];    private [/color][color=#0000bb]string path2[/color][color=#007700];    private [/color][color=#0000bb]string commandline[/color][color=#007700];    public [/color][color=#0000bb]filecontrol[/color][color=#007700]() {       }    [/color][color=#ff8000]/* method of filecontrol class*/    [/color][color=#007700]public [/color][color=#0000bb]void getcommand[/color][color=#007700]() [/color][color=#0000bb]throws ioexception[/color][color=#007700]{        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"put command: "[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]read[/color][color=#007700]([/color][color=#0000bb]commandinput[/color][color=#007700]);        [/color][color=#ff8000]// change command form byte to char        [/color][color=#007700]for ( [/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]<[/color][color=#0000bb]commandinput[/color][color=#007700].[/color][color=#0000bb]length[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++ ) {            [/color][color=#0000bb]arrchar[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]] = ([/color][color=#0000bb]char[/color][color=#007700]) [/color][color=#0000bb]commandinput[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]];            [/color][color=#ff8000]//debug read console            //system.out.print( "" + arrchar[i] );        [/color][color=#007700]}        [/color][color=#ff8000]// convert char to string        [/color][color=#0000bb]commandline [/color][color=#007700]= new [/color][color=#0000bb]string[/color][color=#007700]([/color][color=#0000bb]arrchar[/color][color=#007700], [/color][color=#0000bb]0 [/color][color=#007700], [/color][color=#0000bb]arrchar[/color][color=#007700].[/color][color=#0000bb]length[/color][color=#007700]);        [/color][color=#0000bb]commandline [/color][color=#007700]= [/color][color=#0000bb]commandline [/color][color=#007700]+ [/color][color=#dd0000]" "[/color][color=#007700];        [/color][color=#0000bb]arrchar [/color][color=#007700]= [/color][color=#0000bb]commandline[/color][color=#007700].[/color][color=#0000bb]tochararray[/color][color=#007700]();    }    [/color][color=#ff8000]// copy file    [/color][color=#007700]@[/color][color=#0000bb]suppresswarnings[/color][color=#007700]([/color][color=#dd0000]"resource"[/color][color=#007700])    public [/color][color=#0000bb]void copyfile[/color][color=#007700]() [/color][color=#0000bb]throws ioexception[/color][color=#007700]{        [/color][color=#0000bb]int i[/color][color=#007700]=[/color][color=#0000bb]3[/color][color=#007700];        while ( [/color][color=#0000bb]arrchar[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]] != [/color][color=#dd0000]' '[/color][color=#007700]) {              [/color][color=#0000bb]i[/color][color=#007700]++;        }        [/color][color=#0000bb]path1 [/color][color=#007700]= new [/color][color=#0000bb]string[/color][color=#007700]([/color][color=#0000bb]arrchar[/color][color=#007700], [/color][color=#0000bb]3[/color][color=#007700], [/color][color=#0000bb]i[/color][color=#007700]-[/color][color=#0000bb]3[/color][color=#007700]);        [/color][color=#0000bb]path1 [/color][color=#007700]= [/color][color=#0000bb]path1[/color][color=#007700].[/color][color=#0000bb]trim[/color][color=#007700]();        [/color][color=#0000bb]path2 [/color][color=#007700]= new [/color][color=#0000bb]string[/color][color=#007700]([/color][color=#0000bb]arrchar[/color][color=#007700], [/color][color=#0000bb]i[/color][color=#007700]+[/color][color=#0000bb]1[/color][color=#007700], [/color][color=#0000bb]arrchar[/color][color=#007700].[/color][color=#0000bb]length[/color][color=#007700]-[/color][color=#0000bb]i[/color][color=#007700]-[/color][color=#0000bb]1[/color][color=#007700]);        [/color][color=#0000bb]path2 [/color][color=#007700]= [/color][color=#0000bb]path2[/color][color=#007700].[/color][color=#0000bb]trim[/color][color=#007700]();        [/color][color=#ff8000]//system.out.println("debug: " + path1);        //system.out.println("debug: " + path2 + " " + command.length);        [/color][color=#0000bb]fileinputstream fin [/color][color=#007700];        [/color][color=#0000bb]fileoutputstream fout[/color][color=#007700];        [/color][color=#ff8000]// access to file input        [/color][color=#007700]try {            try {                [/color][color=#ff8000]//fin = new fileinputstream("f:\\tungn1.txt");                [/color][color=#0000bb]fin [/color][color=#007700]= new [/color][color=#0000bb]fileinputstream[/color][color=#007700]([/color][color=#0000bb]path1[/color][color=#007700]);            } catch ( [/color][color=#0000bb]filenotfoundexception exc [/color][color=#007700]) {                [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"file not found in path " [/color][color=#007700]+ [/color][color=#0000bb]path1[/color][color=#007700]);                return;            }            [/color][color=#ff8000]// access to file output            [/color][color=#007700]try {                [/color][color=#ff8000]//fout = new fileoutputstream("e:\\copy.txt");                [/color][color=#0000bb]fout [/color][color=#007700]= new [/color][color=#0000bb]fileoutputstream[/color][color=#007700]([/color][color=#0000bb]path2[/color][color=#007700]);            } catch ( [/color][color=#0000bb]filenotfoundexception exc [/color][color=#007700]) {                [/color][color=#ff8000]//system.out.println("file not found in path " + path2);                [/color][color=#0000bb]file fcopy [/color][color=#007700]= new [/color][color=#0000bb]file[/color][color=#007700]([/color][color=#0000bb]path2[/color][color=#007700]);                [/color][color=#0000bb]fcopy[/color][color=#007700].[/color][color=#0000bb]createnewfile[/color][color=#007700]();                [/color][color=#0000bb]fout [/color][color=#007700]= new [/color][color=#0000bb]fileoutputstream[/color][color=#007700]([/color][color=#0000bb]path2[/color][color=#007700]);                return;            }        } catch ( [/color][color=#0000bb]arrayindexoutofbound***ception exc[/color][color=#007700]) {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"" [/color][color=#007700]+ [/color][color=#0000bb]exc[/color][color=#007700]);            return;        }         [/color][color=#ff8000]// copy file        [/color][color=#0000bb]int j[/color][color=#007700]=[/color][color=#0000bb]0[/color][color=#007700];        do {            [/color][color=#0000bb]j [/color][color=#007700]= [/color][color=#0000bb]fin[/color][color=#007700].[/color][color=#0000bb]read[/color][color=#007700]();            if ( [/color][color=#0000bb]j [/color][color=#007700]!= -[/color][color=#0000bb]1 [/color][color=#007700]) {                [/color][color=#0000bb]fout[/color][color=#007700].[/color][color=#0000bb]write[/color][color=#007700]([/color][color=#0000bb]j[/color][color=#007700]);            }        } while ( [/color][color=#0000bb]j [/color][color=#007700]!= -[/color][color=#0000bb]1 [/color][color=#007700]);        [/color][color=#0000bb]fin[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();        [/color][color=#0000bb]fout[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"finish"[/color][color=#007700]);    }     [/color][color=#ff8000]// move file    [/color][color=#007700]public [/color][color=#0000bb]void movefile[/color][color=#007700]() [/color][color=#0000bb]throws ioexception [/color][color=#007700]{        [/color][color=#0000bb]copyfile[/color][color=#007700]();        [/color][color=#0000bb]file fdel[/color][color=#007700];        [/color][color=#0000bb]fdel [/color][color=#007700]= new [/color][color=#0000bb]file[/color][color=#007700]([/color][color=#0000bb]path1[/color][color=#007700]);        [/color][color=#0000bb]fdel[/color][color=#007700].[/color][color=#0000bb]delete[/color][color=#007700]();    }    [/color][color=#ff8000]// delete file    [/color][color=#007700]public [/color][color=#0000bb]void deletefile[/color][color=#007700]() [/color][color=#0000bb]throws ioexception [/color][color=#007700]{        [/color][color=#0000bb]file fdel[/color][color=#007700];        [/color][color=#0000bb]byte[/color][color=#007700][] [/color][color=#0000bb]confirm [/color][color=#007700]= new [/color][color=#0000bb]byte[/color][color=#007700][[/color][color=#0000bb]100[/color][color=#007700]];        [/color][color=#0000bb]int i [/color][color=#007700]= [/color][color=#0000bb]3[/color][color=#007700];        while ( [/color][color=#0000bb]arrchar[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]] != [/color][color=#dd0000]' ' [/color][color=#007700]) {            [/color][color=#0000bb]i[/color][color=#007700]++;        }        [/color][color=#0000bb]string path [/color][color=#007700]= new [/color][color=#0000bb]string[/color][color=#007700]([/color][color=#0000bb]arrchar[/color][color=#007700], [/color][color=#0000bb]3[/color][color=#007700], [/color][color=#0000bb]i[/color][color=#007700]-[/color][color=#0000bb]3[/color][color=#007700]);        [/color][color=#0000bb]path [/color][color=#007700]= [/color][color=#0000bb]path[/color][color=#007700].[/color][color=#0000bb]trim[/color][color=#007700]();        [/color][color=#0000bb]fdel [/color][color=#007700]= new [/color][color=#0000bb]file[/color][color=#007700]([/color][color=#0000bb]path[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"do you want to delete file " [/color][color=#007700]+ [/color][color=#0000bb]path [/color][color=#007700]+ [/color][color=#dd0000]" ?" [/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]read[/color][color=#007700]([/color][color=#0000bb]confirm[/color][color=#007700]);        if (([/color][color=#0000bb]char[/color][color=#007700]) [/color][color=#0000bb]confirm[/color][color=#007700][[/color][color=#0000bb]0[/color][color=#007700]] == [/color][color=#dd0000]'y' [/color][color=#007700]|| ([/color][color=#0000bb]char[/color][color=#007700]) [/color][color=#0000bb]confirm[/color][color=#007700][[/color][color=#0000bb]0[/color][color=#007700]] == [/color][color=#dd0000]'y'[/color][color=#007700]) {            [/color][color=#0000bb]fdel[/color][color=#007700].[/color][color=#0000bb]delete[/color][color=#007700]();            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"delete complete"[/color][color=#007700]);        } else {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"cancel delete file " [/color][color=#007700]+ [/color][color=#0000bb]path[/color][color=#007700]);        }    }    [/color][color=#ff8000]// choose command    [/color][color=#007700]public [/color][color=#0000bb]void choosecommand[/color][color=#007700]() [/color][color=#0000bb]throws ioexception[/color][color=#007700]{        [/color][color=#0000bb]getcommand[/color][color=#007700]();        [/color][color=#0000bb]string commandline [/color][color=#007700]= new [/color][color=#0000bb]string[/color][color=#007700]([/color][color=#0000bb]arrchar[/color][color=#007700], [/color][color=#0000bb]0[/color][color=#007700], [/color][color=#0000bb]2[/color][color=#007700]);        if ([/color][color=#0000bb]commandline[/color][color=#007700].[/color][color=#0000bb]equalsignorecase[/color][color=#007700]([/color][color=#dd0000]"cp"[/color][color=#007700])) {            [/color][color=#0000bb]copyfile[/color][color=#007700]();        } else {            if ([/color][color=#0000bb]commandline[/color][color=#007700].[/color][color=#0000bb]equalsignorecase[/color][color=#007700]([/color][color=#dd0000]"mv"[/color][color=#007700])) {                [/color][color=#0000bb]movefile[/color][color=#007700]();            } else {                if ([/color][color=#0000bb]commandline[/color][color=#007700].[/color][color=#0000bb]equalsignorecase[/color][color=#007700]([/color][color=#dd0000]"dl"[/color][color=#007700])) {                    [/color][color=#0000bb]deletefile[/color][color=#007700]();                } else {                    [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"can not excute this command " [/color][color=#007700]+ [/color][color=#0000bb]commandline[/color][color=#007700]);                }            }        }    }} [/color][color=#ff8000]// main class[/color][color=#0000bb]package controlfile[/color][color=#007700]; [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]ioexception[/color][color=#007700]; public class [/color][color=#0000bb]main [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) [/color][color=#0000bb]throws ioexception [/color][color=#007700]{        [/color][color=#0000bb]filecontrol file1 [/color][color=#007700]= new [/color][color=#0000bb]filecontrol[/color][color=#007700]();        [/color][color=#0000bb]file1[/color][color=#007700].[/color][color=#0000bb]choosecommand[/color][color=#007700]();    }} [/color] 

</blockquote></div>
</div>
</div>

[summercool434]

cho mình hỏi chút, tại sao trong đoạn này biến i có kiểu int mà vẫn convert đc sang dạng char (a,b,c,...) thế??

int i;
        do {
            i = f.read();
            if (i != -1) {
                system.out.print((char) i);
            }
        } while (i != -1);

[levantai060589]

cho mình hỏi chút, tại sao trong đoạn này biến i có kiểu int mà vẫn convert đc sang dạng char (a,b,c,...) thế??

int i;
		do {
			i = f.read();
			if (i != -1) {
				system.out.print((char) i);
			}
		} while (i != -1);

theo mình nghĩ biến int i sẽ nhận gía trị trả về là các số 0 1 sau đó lệnh in print sẽ dịch i ra thành dạng char
mình đã bỏ (char) và kết quả ra toàn là số thôi

[JuliaAnna1206]

<div class="bbcodeblock bbcodequote bbcmspoilerblock">
<div class="attribution type"><noscript>my exercise (move your mouse to reveal the content)</noscript>

my exercise (open)
my exercise (close)

</div>
<div class="quotecontent">
<div class="bbcm_spoiler_noscript"><blockquote>

[color=#000000]
package hoc[/color][color=#007700].[/color][color=#0000bb]java[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]fileinputstream[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]file[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]filenotfoundexception[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]fileoutputstream[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]ioexception[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700]; public class [/color][color=#0000bb]unit27 [/color][color=#007700]{ public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) [/color][color=#0000bb]throws ioexception [/color][color=#007700]{[/color][color=#0000bb]int chucnang[/color][color=#007700];[/color][color=#0000bb]scanner in [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"moi ban chon chuc nang:"[/color][color=#007700]);[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"1: copy"[/color][color=#007700]);[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"2: move"[/color][color=#007700]);[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"3: delete"[/color][color=#007700]);[/color][color=#0000bb]chucnang [/color][color=#007700]= [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]();try {[/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();switch ([/color][color=#0000bb]chucnang[/color][color=#007700]) {case ([/color][color=#0000bb]1[/color][color=#007700]): {[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhap source file:"[/color][color=#007700]);[/color][color=#0000bb]string src [/color][color=#007700]= [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhap dest file:"[/color][color=#007700]);[/color][color=#0000bb]string dest [/color][color=#007700]= [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();[/color][color=#0000bb]copy[/color][color=#007700]([/color][color=#0000bb]src[/color][color=#007700], [/color][color=#0000bb]dest[/color][color=#007700]);}case ([/color][color=#0000bb]2[/color][color=#007700]): {[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhap source file:"[/color][color=#007700]);[/color][color=#0000bb]string src [/color][color=#007700]= [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhap dest file:"[/color][color=#007700]);[/color][color=#0000bb]string dest [/color][color=#007700]= [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();[/color][color=#0000bb]copy[/color][color=#007700]([/color][color=#0000bb]src[/color][color=#007700], [/color][color=#0000bb]dest[/color][color=#007700]);[/color][color=#0000bb]delete[/color][color=#007700]([/color][color=#0000bb]src[/color][color=#007700]);}case ([/color][color=#0000bb]3[/color][color=#007700]): {[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"moi ban nhap file can xoa"[/color][color=#007700]);[/color][color=#0000bb]string file [/color][color=#007700]= [/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();[/color][color=#0000bb]delete[/color][color=#007700]([/color][color=#0000bb]file[/color][color=#007700]); }default:return;}} catch ([/color][color=#0000bb]ioexception exc[/color][color=#007700]) {[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"co loi xay ra"[/color][color=#007700]);return;} } public static [/color][color=#0000bb]void delete[/color][color=#007700]([/color][color=#0000bb]string filename[/color][color=#007700]) {[/color][color=#0000bb]file f [/color][color=#007700]= new [/color][color=#0000bb]file[/color][color=#007700]([/color][color=#0000bb]filename[/color][color=#007700]);[/color][color=#0000bb]f[/color][color=#007700].[/color][color=#0000bb]delete[/color][color=#007700]();}  public static [/color][color=#0000bb]void copy[/color][color=#007700]([/color][color=#0000bb]string str1[/color][color=#007700], [/color][color=#0000bb]string str2[/color][color=#007700]) [/color][color=#0000bb]throws ioexception [/color][color=#007700]{[/color][color=#0000bb]fileinputstream fin[/color][color=#007700];[/color][color=#0000bb]fileoutputstream fout[/color][color=#007700];try {try {[/color][color=#0000bb]fin [/color][color=#007700]= new [/color][color=#0000bb]fileinputstream[/color][color=#007700]([/color][color=#0000bb]str1[/color][color=#007700]);} catch ([/color][color=#0000bb]filenotfoundexception exc[/color][color=#007700]) {[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"file not found"[/color][color=#007700]);return;}try {[/color][color=#0000bb]fout [/color][color=#007700]= new [/color][color=#0000bb]fileoutputstream[/color][color=#007700]([/color][color=#0000bb]str2[/color][color=#007700]);} catch ([/color][color=#0000bb]filenotfoundexception exc[/color][color=#007700]) {[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"err open file"[/color][color=#007700]);return;}} catch ([/color][color=#0000bb]arrayindexoutofbound***ception exc[/color][color=#007700]) {[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"usage: copyfile from to"[/color][color=#007700]);return;} [/color][color=#ff8000]// copy[/color][color=#0000bb]int i[/color][color=#007700];try {do {[/color][color=#0000bb]i [/color][color=#007700]= [/color][color=#0000bb]fin[/color][color=#007700].[/color][color=#0000bb]read[/color][color=#007700]();if ([/color][color=#0000bb]i [/color][color=#007700]!= -[/color][color=#0000bb]1[/color][color=#007700]) {[/color][color=#0000bb]fout[/color][color=#007700].[/color][color=#0000bb]write[/color][color=#007700]([/color][color=#0000bb]i[/color][color=#007700]);}} while ([/color][color=#0000bb]i [/color][color=#007700]!= -[/color][color=#0000bb]1[/color][color=#007700]);} catch ([/color][color=#0000bb]ioexception exc[/color][color=#007700]) {[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"copy file err"[/color][color=#007700]);}[/color][color=#0000bb]fin[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();[/color][color=#0000bb]fout[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700](); }    }[/color] 

</blockquote></div>
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[ntphong1510]

của mình.

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package streamfile[/color][color=#007700];  [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]fileinputstream[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]filenotfoundexception[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]fileoutputstream[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]ioexception[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700]; public class [/color][color=#0000bb]copyapp [/color][color=#007700]{public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) [/color][color=#0000bb]throws ioexception [/color][color=#007700]{[/color][color=#0000bb]scanner inp[/color][color=#007700]=new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);[/color][color=#0000bb]string str[/color][color=#007700],[/color][color=#0000bb]addin[/color][color=#007700],[/color][color=#0000bb]addout[/color][color=#007700];[/color][color=#0000bb]int k[/color][color=#007700]=[/color][color=#0000bb]1[/color][color=#007700];[/color][color=#ff8000]//gan vao lenh do_while[/color][color=#0000bb]fileinputstream fi[/color][color=#007700];[/color][color=#0000bb]fileoutputstream fo[/color][color=#007700];[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"write 'copy' if you want to copy... "[/color][color=#007700]);[/color][color=#0000bb]str[/color][color=#007700]=[/color][color=#0000bb]inp[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();if([/color][color=#0000bb]str[/color][color=#007700].[/color][color=#0000bb]trim[/color][color=#007700]().[/color][color=#0000bb]equals[/color][color=#007700]([/color][color=#dd0000]"copy"[/color][color=#007700])||[/color][color=#0000bb]str[/color][color=#007700].[/color][color=#0000bb]trim[/color][color=#007700]().[/color][color=#0000bb]equals[/color][color=#007700]([/color][color=#dd0000]"copy"[/color][color=#007700])){[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"let put the address: "[/color][color=#007700]);[/color][color=#0000bb]addin[/color][color=#007700]=[/color][color=#0000bb]inp[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();[/color][color=#ff8000]//buoc 2 nhap ten file vao kiem tra xem file co ton tai hay ko. [/color][color=#007700]do{try{[/color][color=#0000bb]fi[/color][color=#007700]=new [/color][color=#0000bb]fileinputstream[/color][color=#007700]([/color][color=#0000bb]addin[/color][color=#007700]);[/color][color=#0000bb]k[/color][color=#007700]=[/color][color=#0000bb]2[/color][color=#007700];}catch([/color][color=#0000bb]filenotfoundexception e[/color][color=#007700]){[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"file is not available! please try again:... "[/color][color=#007700]);return;}}while([/color][color=#0000bb]k[/color][color=#007700]==[/color][color=#0000bb]1[/color][color=#007700]);[/color][color=#ff8000]//hoi file dich[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"where do you want to copy?... "[/color][color=#007700]);[/color][color=#0000bb]addout[/color][color=#007700]=[/color][color=#0000bb]inp[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();do{try{[/color][color=#0000bb]fo[/color][color=#007700]=new [/color][color=#0000bb]fileoutputstream[/color][color=#007700]([/color][color=#0000bb]addout[/color][color=#007700]);[/color][color=#0000bb]k[/color][color=#007700]=[/color][color=#0000bb]1[/color][color=#007700];}catch([/color][color=#0000bb]filenotfoundexception e[/color][color=#007700]){[/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"file is not available! please try again:... "[/color][color=#007700]);return;}}while([/color][color=#0000bb]k[/color][color=#007700]==[/color][color=#0000bb]2[/color][color=#007700]);[/color][color=#ff8000]//copy[/color][color=#0000bb]int i[/color][color=#007700];do{[/color][color=#0000bb]i[/color][color=#007700]=[/color][color=#0000bb]fi[/color][color=#007700].[/color][color=#0000bb]read[/color][color=#007700]();if([/color][color=#0000bb]i[/color][color=#007700]!=-[/color][color=#0000bb]1[/color][color=#007700])[/color][color=#0000bb]fo[/color][color=#007700].[/color][color=#0000bb]write[/color][color=#007700]([/color][color=#0000bb]i[/color][color=#007700]);}while([/color][color=#0000bb]i[/color][color=#007700]!=-[/color][color=#0000bb]1[/color][color=#007700]); }}}[/color]