Bài 17: Nạp chồng phương thức (overloading method) trong Java

[mika8293]

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bài này chỉ cần làm đơn giản để hiểu phương thứcoverloading như thế nào thôi[/color][color=#007700]. [/color][color=#0000bb]như thế là đã đủ yêucầu rồi[/color][color=#007700].[/color][color=#0000bb]package structure[/color][color=#007700]; class [/color][color=#0000bb]merchandise [/color][color=#007700]{       [/color][color=#0000bb]float price[/color][color=#007700], [/color][color=#0000bb]mount[/color][color=#007700];    [/color][color=#0000bb]string name[/color][color=#007700], [/color][color=#0000bb]serri[/color][color=#007700];       public [/color][color=#0000bb]void setnameserri[/color][color=#007700]([/color][color=#0000bb]string name[/color][color=#007700], [/color][color=#0000bb]string serri[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]name [/color][color=#007700]= [/color][color=#0000bb]name[/color][color=#007700];        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]serri [/color][color=#007700]= [/color][color=#0000bb]serri[/color][color=#007700];    }       public [/color][color=#0000bb]void setpricemount[/color][color=#007700]([/color][color=#0000bb]float price[/color][color=#007700], [/color][color=#0000bb]float mount[/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]"thanhtien: "[/color][color=#007700]+([/color][color=#0000bb]mount[/color][color=#007700]*[/color][color=#0000bb]price[/color][color=#007700])); [/color][color=#ff8000]//+(this.price*this.mount);    [/color][color=#007700]}       public [/color][color=#0000bb]void setpricemount[/color][color=#007700]([/color][color=#0000bb]float price[/color][color=#007700], [/color][color=#0000bb]float mount[/color][color=#007700], [/color][color=#0000bb]float sale[/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]"sale: total bill: "[/color][color=#007700]+([/color][color=#0000bb]price[/color][color=#007700]*[/color][color=#0000bb]mount[/color][color=#007700]*[/color][color=#0000bb]sale [/color][color=#007700]));    }} public class [/color][color=#0000bb]product [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string args [/color][color=#007700][]) {               [/color][color=#0000bb]merchandise product [/color][color=#007700]= new [/color][color=#0000bb]merchandise[/color][color=#007700]();        [/color][color=#0000bb]product[/color][color=#007700].[/color][color=#0000bb]setpricemount[/color][color=#007700]([/color][color=#0000bb]8000[/color][color=#007700], [/color][color=#0000bb]8[/color][color=#007700]);        [/color][color=#0000bb]product[/color][color=#007700].[/color][color=#0000bb]setpricemount[/color][color=#007700]([/color][color=#0000bb]8000[/color][color=#007700], [/color][color=#0000bb]8[/color][color=#007700], (float)[/color][color=#0000bb]95[/color][color=#007700]/[/color][color=#0000bb]100[/color][color=#007700]);           }[/color][color=#ff8000]//method main.[/color][color=#007700]}[/color][color=#ff8000]//class product.[/color] 

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[ban_rechuot93]

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khi thì chẳng úp được bài nào[/color][color=#007700]. [/color][color=#0000bb]lúc làm 1 lần 2 cái[/color][color=#007700].[/color] 

[phamtri]

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[/color][color=#ff8000]//class hàng hóa gồm các thuộc tính: mã hàng, tên hàng, giá, số lượng.//tạo phương thức tính tiền tổng hóa đơn hàng hóa đó với 2 tham số truyền vào là giá, và số lượng.//tạo phương thức nạp chồng phương thức trên, có thêm tham số truyền vào nữa là % giảm giá.//tính tiền dựa vào các thông số này!//tạo đối tượng dựa và class trên và hiện thị thông tin hóa đơn ra ngoài theo từng trường hợp!  [/color][color=#0000bb]package bai17[/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]bai17 [/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]hanghoa a [/color][color=#007700]= new [/color][color=#0000bb]hanghoa[/color][color=#007700]();        [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]nhap[/color][color=#007700]();        [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]showhd[/color][color=#007700]();    }}class [/color][color=#0000bb]hanghoa[/color][color=#007700]{    private [/color][color=#0000bb]string tenhang[/color][color=#007700];    private [/color][color=#0000bb]string mahang[/color][color=#007700];    private [/color][color=#0000bb]int soluong[/color][color=#007700];    private [/color][color=#0000bb]long giahang[/color][color=#007700];    private [/color][color=#0000bb]float giamgia[/color][color=#007700];     public [/color][color=#0000bb]void settenhang[/color][color=#007700]([/color][color=#0000bb]string tenhang[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]tenhang [/color][color=#007700]= [/color][color=#0000bb]tenhang[/color][color=#007700];    }     public [/color][color=#0000bb]void setmahang[/color][color=#007700]([/color][color=#0000bb]string mahang[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]mahang [/color][color=#007700]= [/color][color=#0000bb]mahang[/color][color=#007700];    }     public [/color][color=#0000bb]void setsoluong[/color][color=#007700]([/color][color=#0000bb]int soluong[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]soluong [/color][color=#007700]= [/color][color=#0000bb]soluong[/color][color=#007700];    }     public [/color][color=#0000bb]void setgiahang[/color][color=#007700]([/color][color=#0000bb]long giahang[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]giahang [/color][color=#007700]= [/color][color=#0000bb]giahang[/color][color=#007700];    }     public [/color][color=#0000bb]string gettenhang[/color][color=#007700]() {        return [/color][color=#0000bb]tenhang[/color][color=#007700];    }     public [/color][color=#0000bb]string getmahang[/color][color=#007700]() {        return [/color][color=#0000bb]mahang[/color][color=#007700];    }     public [/color][color=#0000bb]int getsoluong[/color][color=#007700]() {        return [/color][color=#0000bb]soluong[/color][color=#007700];    }     public [/color][color=#0000bb]long getgiahang[/color][color=#007700]() {        return [/color][color=#0000bb]giahang[/color][color=#007700];    }     public [/color][color=#0000bb]void setgiamgia[/color][color=#007700]([/color][color=#0000bb]float giamgia[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]giamgia [/color][color=#007700]= [/color][color=#0000bb]giamgia[/color][color=#007700];    }     public [/color][color=#0000bb]float getgiamgia[/color][color=#007700]() {        return [/color][color=#0000bb]giamgia[/color][color=#007700];    }       public [/color][color=#0000bb]void nhap[/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]"nhập tên hàng: "[/color][color=#007700]);        [/color][color=#0000bb]settenhang[/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]"nhập mã hàng: "[/color][color=#007700]);        [/color][color=#0000bb]setmahang[/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]"nhập số lượng: "[/color][color=#007700]);        [/color][color=#0000bb]setsoluong[/color][color=#007700]([/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextint[/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]"nhập giá: "[/color][color=#007700]);        [/color][color=#0000bb]setgiahang[/color][color=#007700]([/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextlong[/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]"giảm giá: "[/color][color=#007700]);        [/color][color=#0000bb]setgiamgia[/color][color=#007700]([/color][color=#0000bb]in[/color][color=#007700].[/color][color=#0000bb]nextfloat[/color][color=#007700]());}    public [/color][color=#0000bb]float tong[/color][color=#007700]([/color][color=#0000bb]long giahang[/color][color=#007700],[/color][color=#0000bb]int soluong[/color][color=#007700]){        return ([/color][color=#0000bb]getgiahang[/color][color=#007700]()*[/color][color=#0000bb]getsoluong[/color][color=#007700]());    }    public [/color][color=#0000bb]float tong[/color][color=#007700]([/color][color=#0000bb]long giahang[/color][color=#007700],[/color][color=#0000bb]int soluong[/color][color=#007700],[/color][color=#0000bb]float giamgia[/color][color=#007700]){        return (([/color][color=#0000bb]getgiahang[/color][color=#007700]()*[/color][color=#0000bb]getsoluong[/color][color=#007700]())*([/color][color=#0000bb]100[/color][color=#007700]-[/color][color=#0000bb]giamgia[/color][color=#007700])/[/color][color=#0000bb]100[/color][color=#007700]);    }    public [/color][color=#0000bb]void showhd[/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]"thông tin hàng"[/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]"tên hàng: "[/color][color=#007700]+[/color][color=#0000bb]gettenhang[/color][color=#007700]()+[/color][color=#dd0000]"      -mã hàng: "[/color][color=#007700]+[/color][color=#0000bb]getmahang[/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]"số lượng: "[/color][color=#007700]+[/color][color=#0000bb]getsoluong[/color][color=#007700]()+[/color][color=#dd0000]"      -giá hàng: "[/color][color=#007700]+[/color][color=#0000bb]getgiahang[/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]"tổng khi chưa giảm giá: "[/color][color=#007700]+[/color][color=#0000bb]tong[/color][color=#007700]([/color][color=#0000bb]giahang[/color][color=#007700], [/color][color=#0000bb]soluong[/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]"tổng khi giảm "[/color][color=#007700]+[/color][color=#0000bb]getgiamgia[/color][color=#007700]()+ [/color][color=#dd0000]" là: "[/color][color=#007700]+[/color][color=#0000bb]tong[/color][color=#007700]([/color][color=#0000bb]giahang[/color][color=#007700], [/color][color=#0000bb]soluong[/color][color=#007700], [/color][color=#0000bb]giamgia[/color][color=#007700]));    }}[/color] 

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[hoahalexo]

rất hay

[ngtuananh1122]

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package abc[/color][color=#007700]; [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].*;class [/color][color=#0000bb]hanghoa [/color][color=#007700]{    public [/color][color=#0000bb]string mahang[/color][color=#007700];    public [/color][color=#0000bb]string tenhang[/color][color=#007700];    public [/color][color=#0000bb]float gia[/color][color=#007700];    public [/color][color=#0000bb]int soluong[/color][color=#007700];    public [/color][color=#0000bb]float phantramgiam[/color][color=#007700];    public [/color][color=#0000bb]float hoadon[/color][color=#007700]([/color][color=#0000bb]float gia[/color][color=#007700],[/color][color=#0000bb]int soluong[/color][color=#007700]){        return [/color][color=#0000bb]gia [/color][color=#007700]* [/color][color=#0000bb]soluong[/color][color=#007700];    }       public [/color][color=#0000bb]float hoadon[/color][color=#007700]([/color][color=#0000bb]float gia[/color][color=#007700],[/color][color=#0000bb]int soluong[/color][color=#007700],[/color][color=#0000bb]float phantramgiam[/color][color=#007700]){        return [/color][color=#0000bb]gia [/color][color=#007700]* [/color][color=#0000bb]soluong [/color][color=#007700]* ([/color][color=#0000bb]phantramgiam[/color][color=#007700]/[/color][color=#0000bb]100[/color][color=#007700]);    }}public class [/color][color=#0000bb]baitap [/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]hanghoa a [/color][color=#007700]= new [/color][color=#0000bb]hanghoa[/color][color=#007700]();        [/color][color=#0000bb]scanner nhapdulieu [/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]"ten hang: "[/color][color=#007700]);        [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]tenhang [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/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]"ma hang: "[/color][color=#007700]);        [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]mahang [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/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]"don gia :"[/color][color=#007700]);        [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]gia [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextfloat[/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]"so luong :"[/color][color=#007700]);        [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]soluong [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextint[/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]"phan tram giam gia :"[/color][color=#007700]);        [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]phantramgiam [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextfloat[/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]"hoa don"[/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]"ten hang: "[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]tenhang[/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]"ma hang "[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]mahang[/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]"don gia: "[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]gia[/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]"so luong: "[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]soluong[/color][color=#007700]);        if([/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]phantramgiam [/color][color=#007700]==[/color][color=#0000bb]0 [/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]"tong so tien phai tra :"[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]hoadon[/color][color=#007700]([/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]gia[/color][color=#007700], [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]soluong[/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]"tong so tien phai tra :"[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]hoadon[/color][color=#007700]([/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]gia[/color][color=#007700], [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]soluong[/color][color=#007700],[/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]phantramgiam[/color][color=#007700]));            }} [/color] 

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[namho2231]

đây là bài của mình, mong các bạn chỉ bảo: :d
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package com[/color][color=#007700].[/color][color=#0000bb]hanhnv[/color][color=#007700].[/color][color=#0000bb]bai17[/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]bai17 [/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]goods goods [/color][color=#007700]= new [/color][color=#0000bb]goods[/color][color=#007700]();        [/color][color=#0000bb]goods[/color][color=#007700].[/color][color=#0000bb]inputgoods[/color][color=#007700]();        [/color][color=#0000bb]goods[/color][color=#007700].[/color][color=#0000bb]outputgoods[/color][color=#007700]();    }} class [/color][color=#0000bb]goods [/color][color=#007700]{    private [/color][color=#0000bb]string goodscode[/color][color=#007700], [/color][color=#0000bb]goodsname[/color][color=#007700];    private [/color][color=#0000bb]int goodsprice[/color][color=#007700];    private [/color][color=#0000bb]int goodsquantity[/color][color=#007700];    private [/color][color=#0000bb]int goodsdiscount[/color][color=#007700];     public [/color][color=#0000bb]int getgoodsdiscount[/color][color=#007700]() {        return [/color][color=#0000bb]goodsdiscount[/color][color=#007700];    }     public [/color][color=#0000bb]void setgoodsdiscount[/color][color=#007700]([/color][color=#0000bb]int goodsdiscount[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]goodsdiscount [/color][color=#007700]= [/color][color=#0000bb]goodsdiscount[/color][color=#007700];    }     public [/color][color=#0000bb]string getgoodscode[/color][color=#007700]() {        return [/color][color=#0000bb]goodscode[/color][color=#007700];    }     public [/color][color=#0000bb]void setgoodscode[/color][color=#007700]([/color][color=#0000bb]string goodscode[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]goodscode [/color][color=#007700]= [/color][color=#0000bb]goodscode[/color][color=#007700];    }     public [/color][color=#0000bb]string getgoodsname[/color][color=#007700]() {        return [/color][color=#0000bb]goodsname[/color][color=#007700];    }     public [/color][color=#0000bb]void setgoodsname[/color][color=#007700]([/color][color=#0000bb]string goodsname[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]goodsname [/color][color=#007700]= [/color][color=#0000bb]goodsname[/color][color=#007700];    }     public [/color][color=#0000bb]int getgoodsprice[/color][color=#007700]() {        return [/color][color=#0000bb]goodsprice[/color][color=#007700];    }     public [/color][color=#0000bb]void setgoodsprice[/color][color=#007700]([/color][color=#0000bb]int goodsprice[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]goodsprice [/color][color=#007700]= [/color][color=#0000bb]goodsprice[/color][color=#007700];    }     public [/color][color=#0000bb]int getgoodsquantity[/color][color=#007700]() {        return [/color][color=#0000bb]goodsquantity[/color][color=#007700];    }     public [/color][color=#0000bb]void setgoodsquantity[/color][color=#007700]([/color][color=#0000bb]int goodsquantity[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]goodsquantity [/color][color=#007700]= [/color][color=#0000bb]goodsquantity[/color][color=#007700];    }     public [/color][color=#0000bb]void inputgoods[/color][color=#007700]() {        [/color][color=#0000bb]scanner s [/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]"please enter some information about goods!"[/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]"code of goods:"[/color][color=#007700]);        [/color][color=#0000bb]setgoodscode[/color][color=#007700]([/color][color=#0000bb]s[/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]"name of goods:"[/color][color=#007700]);        [/color][color=#0000bb]setgoodsname[/color][color=#007700]([/color][color=#0000bb]s[/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]"quantity of goods:"[/color][color=#007700]);        [/color][color=#0000bb]setgoodsquantity[/color][color=#007700]([/color][color=#0000bb]s[/color][color=#007700].[/color][color=#0000bb]nextint[/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]"price of goods:"[/color][color=#007700]);        [/color][color=#0000bb]setgoodsprice[/color][color=#007700]([/color][color=#0000bb]s[/color][color=#007700].[/color][color=#0000bb]nextint[/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]"percentage of discount:"[/color][color=#007700]);        [/color][color=#0000bb]setgoodsdiscount[/color][color=#007700]([/color][color=#0000bb]s[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]());    }     public [/color][color=#0000bb]void outputgoods[/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]"all information about goods you had entered:"[/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]"code of product: " [/color][color=#007700]+ [/color][color=#0000bb]getgoodscode[/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]"name of product: " [/color][color=#007700]+ [/color][color=#0000bb]getgoodsname[/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]"quantity of product: " [/color][color=#007700]+ [/color][color=#0000bb]getgoodsquantity[/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]"price of product: " [/color][color=#007700]+ [/color][color=#0000bb]getgoodsprice[/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]"total money without discount: "                [/color][color=#007700]+ [/color][color=#0000bb]dosum[/color][color=#007700]([/color][color=#0000bb]getgoodsquantity[/color][color=#007700](), [/color][color=#0000bb]getgoodsprice[/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]"total money after discount: "                        [/color][color=#007700]+ [/color][color=#0000bb]dosum[/color][color=#007700]([/color][color=#0000bb]getgoodsquantity[/color][color=#007700](), [/color][color=#0000bb]getgoodsprice[/color][color=#007700](),                                [/color][color=#0000bb]getgoodsdiscount[/color][color=#007700]()));    }     public [/color][color=#0000bb]int dosum[/color][color=#007700]([/color][color=#0000bb]int quantity[/color][color=#007700], [/color][color=#0000bb]int price[/color][color=#007700]) {        [/color][color=#0000bb]int sum [/color][color=#007700]= [/color][color=#0000bb]quantity [/color][color=#007700]* [/color][color=#0000bb]price[/color][color=#007700];        return [/color][color=#0000bb]sum[/color][color=#007700];    }     public [/color][color=#0000bb]int dosum[/color][color=#007700]([/color][color=#0000bb]int quantity[/color][color=#007700], [/color][color=#0000bb]int price[/color][color=#007700], [/color][color=#0000bb]int discount[/color][color=#007700]) {        [/color][color=#0000bb]int sum [/color][color=#007700]= ([/color][color=#0000bb]quantity [/color][color=#007700]* [/color][color=#0000bb]price[/color][color=#007700]) - ([/color][color=#0000bb]quantity [/color][color=#007700]* [/color][color=#0000bb]price [/color][color=#007700]* [/color][color=#0000bb]discount [/color][color=#007700]/ [/color][color=#0000bb]100[/color][color=#007700]);        return [/color][color=#0000bb]sum[/color][color=#007700];    }}[/color] 

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[trungl289]

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[color=#000000]
package abc[/color][color=#007700]; [/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].*;class [/color][color=#0000bb]hanghoa [/color][color=#007700]{    public [/color][color=#0000bb]string mahang[/color][color=#007700];    public [/color][color=#0000bb]string tenhang[/color][color=#007700];    public [/color][color=#0000bb]float gia[/color][color=#007700];    public [/color][color=#0000bb]int soluong[/color][color=#007700];    public [/color][color=#0000bb]float phantramgiam[/color][color=#007700];    public [/color][color=#0000bb]float hoadon[/color][color=#007700]([/color][color=#0000bb]float gia[/color][color=#007700],[/color][color=#0000bb]int soluong[/color][color=#007700]){        return [/color][color=#0000bb]gia [/color][color=#007700]* [/color][color=#0000bb]soluong[/color][color=#007700];    }     public [/color][color=#0000bb]float hoadon[/color][color=#007700]([/color][color=#0000bb]float gia[/color][color=#007700],[/color][color=#0000bb]int soluong[/color][color=#007700],[/color][color=#0000bb]float phantramgiam[/color][color=#007700]){        return [/color][color=#0000bb]gia [/color][color=#007700]* [/color][color=#0000bb]soluong [/color][color=#007700]* ([/color][color=#0000bb]phantramgiam[/color][color=#007700]/[/color][color=#0000bb]100[/color][color=#007700]);    }}public class [/color][color=#0000bb]baitap [/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]hanghoa a [/color][color=#007700]= new [/color][color=#0000bb]hanghoa[/color][color=#007700]();        [/color][color=#0000bb]scanner nhapdulieu [/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]"ten hang: "[/color][color=#007700]);        [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]tenhang [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/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]"ma hang: "[/color][color=#007700]);        [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]mahang [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/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]"don gia :"[/color][color=#007700]);        [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]gia [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextfloat[/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]"so luong :"[/color][color=#007700]);        [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]soluong [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextint[/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]"phan tram giam gia :"[/color][color=#007700]);        [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]phantramgiam [/color][color=#007700]= [/color][color=#0000bb]nhapdulieu[/color][color=#007700].[/color][color=#0000bb]nextfloat[/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]"hoa don"[/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]"ten hang: "[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]tenhang[/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]"ma hang "[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]mahang[/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]"don gia: "[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]gia[/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]"so luong: "[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]soluong[/color][color=#007700]);        if([/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]phantramgiam [/color][color=#007700]==[/color][color=#0000bb]0 [/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]"tong so tien phai tra :"[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]hoadon[/color][color=#007700]([/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]gia[/color][color=#007700], [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]soluong[/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]"tong so tien phai tra :"[/color][color=#007700]+[/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]hoadon[/color][color=#007700]([/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]gia[/color][color=#007700], [/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]soluong[/color][color=#007700],[/color][color=#0000bb]a[/color][color=#007700].[/color][color=#0000bb]phantramgiam[/color][color=#007700]));          }} [/color] 

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bài của bạn này nếu có giảm giá sẽ tính sai giá tiền.

[color=#000000]
[/color][color=#007700]return [/color][color=#0000bb]gia [/color][color=#007700]* [/color][color=#0000bb]soluong [/color][color=#007700]* ([/color][color=#0000bb]phantramgiam[/color][color=#007700]/[/color][color=#0000bb]100[/color][color=#007700]);[/color] 

câu lệnh này sẽ tính ra số tiền được giảm thôi chứ không phải tổng tiền phải thanh toán

đúng phải là

[color=#000000]
gia [/color][color=#007700]* [/color][color=#0000bb]soluong  [/color][color=#007700]- ([/color][color=#0000bb]gia [/color][color=#007700]* [/color][color=#0000bb]soluong [/color][color=#007700]* [/color][color=#0000bb]phantramgiam[/color][color=#007700]/[/color][color=#0000bb]100[/color][color=#007700]) [/color][color=#0000bb]hoặc gia [/color][color=#007700]* [/color][color=#0000bb]soluong [/color][color=#007700]* ([/color][color=#0000bb]1 [/color][color=#007700]- [/color][color=#0000bb]phantramgiam[/color][color=#007700]/[/color][color=#0000bb]100[/color][color=#007700])[/color] 

[trangsucnu]

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[color=#000000]
[/color][color=#ff8000]/*    class hàng hóa gồm các thuộc tính: mã hàng, tên hàng, giá, số lượng.    tạo phương thức tính tiền tổng hóa đơn hàng hóa đó với 2 tham số truyền vào là giá, và số lượng.    tạo phương thức nạp chồng phương thức trên, có thêm tham số truyền vào nữa là % giảm giá. tính tiền dựa vào các thông số này!    tạo đối tượng dựa và class trên và hiện thị thông tin hóa đơn ra ngoài theo từng trường hợp!*/[/color][color=#0000bb]package demo_overloading[/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]; class [/color][color=#0000bb]banhang[/color][color=#007700]{    private [/color][color=#0000bb]string mahang[/color][color=#007700];    private [/color][color=#0000bb]string tenhang[/color][color=#007700];    private [/color][color=#0000bb]long giahang[/color][color=#007700];    private [/color][color=#0000bb]int soluong[/color][color=#007700];    private [/color][color=#0000bb]float giamgia[/color][color=#007700];       private [/color][color=#0000bb]long thanhtien[/color][color=#007700];     public [/color][color=#0000bb]string getmahang[/color][color=#007700]() {        return [/color][color=#0000bb]mahang[/color][color=#007700];    }    public [/color][color=#0000bb]string gettenhang[/color][color=#007700]() {        return [/color][color=#0000bb]tenhang[/color][color=#007700];    }    public [/color][color=#0000bb]long getgiahang[/color][color=#007700]() {        return [/color][color=#0000bb]giahang[/color][color=#007700];    }    public [/color][color=#0000bb]int getsoluong[/color][color=#007700]() {        return [/color][color=#0000bb]soluong[/color][color=#007700];    }    public [/color][color=#0000bb]float getgiamgia[/color][color=#007700]() {        return [/color][color=#0000bb]giamgia[/color][color=#007700];    }    public [/color][color=#0000bb]long getthanhtien[/color][color=#007700](){        return [/color][color=#0000bb]thanhtien[/color][color=#007700];    }       public [/color][color=#0000bb]void setmahang[/color][color=#007700]([/color][color=#0000bb]string mahang[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]mahang [/color][color=#007700]= [/color][color=#0000bb]mahang[/color][color=#007700];    }    public [/color][color=#0000bb]void settenhang[/color][color=#007700]([/color][color=#0000bb]string tenhang[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]tenhang [/color][color=#007700]= [/color][color=#0000bb]tenhang[/color][color=#007700];    }    public [/color][color=#0000bb]void setgiahang[/color][color=#007700]([/color][color=#0000bb]long giahang[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]giahang [/color][color=#007700]= [/color][color=#0000bb]giahang[/color][color=#007700];    }    public [/color][color=#0000bb]void setsoluong[/color][color=#007700]([/color][color=#0000bb]int soluong[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]soluong [/color][color=#007700]= [/color][color=#0000bb]soluong[/color][color=#007700];    }    public [/color][color=#0000bb]void setgiamgia[/color][color=#007700]([/color][color=#0000bb]float giamgia[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]giamgia [/color][color=#007700]= [/color][color=#0000bb]giamgia[/color][color=#007700];    }       public [/color][color=#0000bb]void setthanhtien[/color][color=#007700]([/color][color=#0000bb]long thanhtien[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]thanhtien [/color][color=#007700]= [/color][color=#0000bb]thanhtien[/color][color=#007700];    }       public [/color][color=#0000bb]long tinhtien [/color][color=#007700]([/color][color=#0000bb]long giahang[/color][color=#007700], [/color][color=#0000bb]int soluong[/color][color=#007700])    {        return ([/color][color=#0000bb]long[/color][color=#007700]) ([/color][color=#0000bb]giahang[/color][color=#007700]*[/color][color=#0000bb]soluong[/color][color=#007700]);    }    public [/color][color=#0000bb]long tinhtien [/color][color=#007700]([/color][color=#0000bb]long giahang[/color][color=#007700], [/color][color=#0000bb]int soluong[/color][color=#007700], [/color][color=#0000bb]float giamgia[/color][color=#007700])    {        return ([/color][color=#0000bb]long[/color][color=#007700]) ([/color][color=#0000bb]giahang[/color][color=#007700]*[/color][color=#0000bb]soluong[/color][color=#007700]-([/color][color=#0000bb]giahang[/color][color=#007700]*[/color][color=#0000bb]soluong[/color][color=#007700]*([/color][color=#0000bb]giamgia[/color][color=#007700]/[/color][color=#0000bb]100[/color][color=#007700])));    }     public [/color][color=#0000bb]void input [/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]"nhập thông tin hàng hóa"[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhập mã hàng: "[/color][color=#007700]);        [/color][color=#0000bb]setmahang [/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]"nhập tên hàng: "[/color][color=#007700]);        [/color][color=#0000bb]settenhang [/color][color=#007700]([/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]());        do        {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhập giá hàng: "[/color][color=#007700]);            [/color][color=#0000bb]setgiahang [/color][color=#007700]([/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextlong[/color][color=#007700]());        }while ([/color][color=#0000bb]giahang [/color][color=#007700]<=[/color][color=#0000bb]0[/color][color=#007700]);        do        {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhập số lượng: "[/color][color=#007700]);            [/color][color=#0000bb]setsoluong [/color][color=#007700]([/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]());        }while ([/color][color=#0000bb]soluong[/color][color=#007700]<=[/color][color=#0000bb]0[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"giảm giá: "[/color][color=#007700]);        [/color][color=#0000bb]setgiamgia [/color][color=#007700]([/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextfloat[/color][color=#007700]());    }       public [/color][color=#0000bb]void output[/color][color=#007700]()    {        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]""[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"=== thông tin hàng hóa ==="[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"
mã hàng: "[/color][color=#007700]+[/color][color=#0000bb]getmahang[/color][color=#007700]());        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"
tên hàng: "[/color][color=#007700]+[/color][color=#0000bb]gettenhang[/color][color=#007700]());        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"
giá hàng: "[/color][color=#007700]+[/color][color=#0000bb]getgiahang[/color][color=#007700]()+[/color][color=#dd0000]" vnd / 1 đơn vị"[/color][color=#007700]);        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"
số lượng: "[/color][color=#007700]+[/color][color=#0000bb]getsoluong[/color][color=#007700]());        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"
giảm giá: "[/color][color=#007700]+[/color][color=#0000bb]getgiamgia[/color][color=#007700]()+[/color][color=#dd0000]" %"[/color][color=#007700]);               if ([/color][color=#0000bb]giamgia[/color][color=#007700]==[/color][color=#0000bb]0 [/color][color=#007700]|| [/color][color=#0000bb]giamgia[/color][color=#007700]==[/color][color=#0000bb]0.0 [/color][color=#007700]|| [/color][color=#0000bb]giamgia[/color][color=#007700]==[/color][color=#0000bb]0f [/color][color=#007700]|| [/color][color=#0000bb]giamgia[/color][color=#007700]==[/color][color=#0000bb]0.0f[/color][color=#007700])        {            [/color][color=#0000bb]setthanhtien [/color][color=#007700]([/color][color=#0000bb]tinhtien[/color][color=#007700]([/color][color=#0000bb]giahang[/color][color=#007700], [/color][color=#0000bb]soluong[/color][color=#007700]));        }        else        {            [/color][color=#0000bb]setthanhtien[/color][color=#007700]([/color][color=#0000bb]tinhtien [/color][color=#007700]([/color][color=#0000bb]giahang[/color][color=#007700], [/color][color=#0000bb]soluong[/color][color=#007700], [/color][color=#0000bb]giamgia[/color][color=#007700]));        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"
thành tiền: " [/color][color=#007700]+ [/color][color=#0000bb]getthanhtien[/color][color=#007700]()+[/color][color=#dd0000]" vnd"[/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]);    } } public class [/color][color=#0000bb]demo_overloading [/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]banhang bh [/color][color=#007700]= new [/color][color=#0000bb]banhang[/color][color=#007700]();        [/color][color=#0000bb]bh[/color][color=#007700].[/color][color=#0000bb]input[/color][color=#007700]();        [/color][color=#0000bb]bh[/color][color=#007700].[/color][color=#0000bb]output[/color][color=#007700]();    }}[/color] 

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[thuocviet1]

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[color=#000000]
package hanghoa[/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]hanghoa [/color][color=#007700]{       private [/color][color=#0000bb]int mahang[/color][color=#007700];    private [/color][color=#0000bb]string tenhang[/color][color=#007700];    private [/color][color=#0000bb]float gia[/color][color=#007700];    private [/color][color=#0000bb]int soluong[/color][color=#007700];    private [/color][color=#0000bb]int giamgia[/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]hanghoa h[/color][color=#007700]=new [/color][color=#0000bb]hanghoa[/color][color=#007700]();        [/color][color=#0000bb]h[/color][color=#007700].[/color][color=#0000bb]input[/color][color=#007700]();        [/color][color=#0000bb]h[/color][color=#007700].[/color][color=#0000bb]output[/color][color=#007700]();    }             public [/color][color=#0000bb]int getmahang[/color][color=#007700]() {        return [/color][color=#0000bb]mahang[/color][color=#007700];    }       public [/color][color=#0000bb]void setmahang[/color][color=#007700]([/color][color=#0000bb]int mahang[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]mahang [/color][color=#007700]= [/color][color=#0000bb]mahang[/color][color=#007700];    }       public [/color][color=#0000bb]string gettenhang[/color][color=#007700]() {        return [/color][color=#0000bb]tenhang[/color][color=#007700];    }       public [/color][color=#0000bb]void settenhang[/color][color=#007700]([/color][color=#0000bb]string tenhang[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]tenhang [/color][color=#007700]= [/color][color=#0000bb]tenhang[/color][color=#007700];    }       public [/color][color=#0000bb]float getgia[/color][color=#007700]() {        return [/color][color=#0000bb]gia[/color][color=#007700];    }       public [/color][color=#0000bb]void setgia[/color][color=#007700]([/color][color=#0000bb]float gia[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]gia [/color][color=#007700]= [/color][color=#0000bb]gia[/color][color=#007700];    }       public [/color][color=#0000bb]int getsoluong[/color][color=#007700]() {        return [/color][color=#0000bb]soluong[/color][color=#007700];    }       public [/color][color=#0000bb]void setsoluong[/color][color=#007700]([/color][color=#0000bb]int soluong[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]soluong [/color][color=#007700]= [/color][color=#0000bb]soluong[/color][color=#007700];    }          public [/color][color=#0000bb]int getgiamgia[/color][color=#007700]() {        return [/color][color=#0000bb]giamgia[/color][color=#007700];    }       public [/color][color=#0000bb]void setgiamgia[/color][color=#007700]([/color][color=#0000bb]int giamgia[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]giamgia [/color][color=#007700]= [/color][color=#0000bb]giamgia[/color][color=#007700];    }       public [/color][color=#0000bb]float tongtien[/color][color=#007700]([/color][color=#0000bb]float gia[/color][color=#007700], [/color][color=#0000bb]int soluong[/color][color=#007700]){        return [/color][color=#0000bb]gia[/color][color=#007700]*[/color][color=#0000bb]soluong[/color][color=#007700];    }       public [/color][color=#0000bb]float tongtien[/color][color=#007700]([/color][color=#0000bb]float gia[/color][color=#007700], [/color][color=#0000bb]int soluong[/color][color=#007700], [/color][color=#0000bb]int giamgia[/color][color=#007700]){        return [/color][color=#0000bb]gia[/color][color=#007700]*[/color][color=#0000bb]soluong[/color][color=#007700]-[/color][color=#0000bb]gia[/color][color=#007700]*[/color][color=#0000bb]giamgia[/color][color=#007700]*[/color][color=#0000bb]soluong[/color][color=#007700]/[/color][color=#0000bb]100[/color][color=#007700];    }       public [/color][color=#0000bb]void input[/color][color=#007700](){        [/color][color=#0000bb]scanner nhap[/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]"nhap ma hang"[/color][color=#007700]);        [/color][color=#0000bb]setmahang[/color][color=#007700]([/color][color=#0000bb]nhap[/color][color=#007700].[/color][color=#0000bb]nextint[/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 ten hang"[/color][color=#007700]);        [/color][color=#0000bb]settenhang[/color][color=#007700]([/color][color=#0000bb]nhap[/color][color=#007700].[/color][color=#0000bb]next[/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]"gia"[/color][color=#007700]);        [/color][color=#0000bb]setgia[/color][color=#007700]([/color][color=#0000bb]nhap[/color][color=#007700].[/color][color=#0000bb]nextfloat[/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]"so luong"[/color][color=#007700]);        [/color][color=#0000bb]setsoluong[/color][color=#007700]([/color][color=#0000bb]nhap[/color][color=#007700].[/color][color=#0000bb]nextint[/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]"giam gia"[/color][color=#007700]);        [/color][color=#0000bb]setgiamgia[/color][color=#007700]([/color][color=#0000bb]nhap[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]());    }       public [/color][color=#0000bb]void output[/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]"tong tien cua hang hoa khi chua giam gia la "[/color][color=#007700]+[/color][color=#0000bb]tongtien[/color][color=#007700]([/color][color=#0000bb]gia[/color][color=#007700], [/color][color=#0000bb]soluong[/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]"tong tien cua hang hoa khi giam gia "[/color][color=#007700]+[/color][color=#0000bb]getgiamgia[/color][color=#007700]()+[/color][color=#dd0000]"% la "[/color][color=#007700]+[/color][color=#0000bb]tongtien[/color][color=#007700]([/color][color=#0000bb]gia[/color][color=#007700], [/color][color=#0000bb]soluong[/color][color=#007700], [/color][color=#0000bb]giamgia[/color][color=#007700]));    } }[/color] 

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mình mới tham gia mong mọi người giúp đỡ. thanks all!

[xuyentran]

class hanghoa:
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import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]bufferedreader[/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]inputstreamreader[/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]hanghoademo [/color][color=#007700]{    private [/color][color=#0000bb]string tenhang[/color][color=#007700];    private [/color][color=#0000bb]string mahang[/color][color=#007700];    private [/color][color=#0000bb]float dongia[/color][color=#007700];    private [/color][color=#0000bb]int soluong[/color][color=#007700];    private [/color][color=#0000bb]float giamgia[/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]bufferedreader br [/color][color=#007700]= new [/color][color=#0000bb]bufferedreader[/color][color=#007700](new [/color][color=#0000bb]inputstreamreader[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]));     public [/color][color=#0000bb]hanghoademo[/color][color=#007700]() {     }     public [/color][color=#0000bb]hanghoademo[/color][color=#007700]([/color][color=#0000bb]string tenhang[/color][color=#007700], [/color][color=#0000bb]string mahang[/color][color=#007700], [/color][color=#0000bb]float dongia[/color][color=#007700], [/color][color=#0000bb]int soluong[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]tenhang [/color][color=#007700]= [/color][color=#0000bb]tenhang[/color][color=#007700];        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]mahang [/color][color=#007700]= [/color][color=#0000bb]mahang[/color][color=#007700];        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]dongia [/color][color=#007700]= [/color][color=#0000bb]dongia[/color][color=#007700];        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]soluong [/color][color=#007700]= [/color][color=#0000bb]soluong[/color][color=#007700];    }     public [/color][color=#0000bb]string gettenhang[/color][color=#007700]() {        return [/color][color=#0000bb]tenhang[/color][color=#007700];    }     public [/color][color=#0000bb]void settenhang[/color][color=#007700]([/color][color=#0000bb]string tenhang[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]tenhang [/color][color=#007700]= [/color][color=#0000bb]tenhang[/color][color=#007700];    }     public [/color][color=#0000bb]string getmahang[/color][color=#007700]() {        return [/color][color=#0000bb]mahang[/color][color=#007700];    }     public [/color][color=#0000bb]void setmahang[/color][color=#007700]([/color][color=#0000bb]string mahang[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]mahang [/color][color=#007700]= [/color][color=#0000bb]mahang[/color][color=#007700];    }     public [/color][color=#0000bb]float getdongia[/color][color=#007700]() {        return [/color][color=#0000bb]dongia[/color][color=#007700];    }     public [/color][color=#0000bb]void setdongia[/color][color=#007700]([/color][color=#0000bb]float dongia[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]dongia [/color][color=#007700]= [/color][color=#0000bb]dongia[/color][color=#007700];    }     public [/color][color=#0000bb]int getsoluong[/color][color=#007700]() {        return [/color][color=#0000bb]soluong[/color][color=#007700];    }     public [/color][color=#0000bb]void setsoluong[/color][color=#007700]([/color][color=#0000bb]int soluong[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]soluong [/color][color=#007700]= [/color][color=#0000bb]soluong[/color][color=#007700];    }     public [/color][color=#0000bb]float getgiamgia[/color][color=#007700]() {        return [/color][color=#0000bb]giamgia[/color][color=#007700];    }     public [/color][color=#0000bb]void setgiamgia[/color][color=#007700]([/color][color=#0000bb]float giamgia[/color][color=#007700]) {        [/color][color=#0000bb]this[/color][color=#007700].[/color][color=#0000bb]giamgia [/color][color=#007700]= [/color][color=#0000bb]giamgia[/color][color=#007700];    }     public [/color][color=#0000bb]void input[/color][color=#007700]() {        try {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"ten: "[/color][color=#007700]);            [/color][color=#0000bb]settenhang[/color][color=#007700]([/color][color=#0000bb]br[/color][color=#007700].[/color][color=#0000bb]readline[/color][color=#007700]());            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"ma: "[/color][color=#007700]);            [/color][color=#0000bb]setmahang[/color][color=#007700]([/color][color=#0000bb]br[/color][color=#007700].[/color][color=#0000bb]readline[/color][color=#007700]());        } catch ([/color][color=#0000bb]ioexception e[/color][color=#007700]) {            [/color][color=#ff8000]// todo auto-generated catch block            [/color][color=#0000bb]e[/color][color=#007700].[/color][color=#0000bb]printstacktrace[/color][color=#007700]();        }        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"don gia: "[/color][color=#007700]);        [/color][color=#0000bb]setdongia[/color][color=#007700]([/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextfloat[/color][color=#007700]());        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"so luong: "[/color][color=#007700]);        [/color][color=#0000bb]setsoluong[/color][color=#007700]([/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextint[/color][color=#007700]());     }     public [/color][color=#0000bb]double tinhtien[/color][color=#007700]([/color][color=#0000bb]float dongia[/color][color=#007700], [/color][color=#0000bb]int soluong[/color][color=#007700]) {        return ([/color][color=#0000bb]getdongia[/color][color=#007700]() * [/color][color=#0000bb]getsoluong[/color][color=#007700]());    }     public [/color][color=#0000bb]double tinhtien[/color][color=#007700]([/color][color=#0000bb]float dongia[/color][color=#007700], [/color][color=#0000bb]int soluong[/color][color=#007700], [/color][color=#0000bb]float giamgia[/color][color=#007700]) {         do {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"giam gia: "[/color][color=#007700]);            [/color][color=#0000bb]setgiamgia[/color][color=#007700]([/color][color=#0000bb]input[/color][color=#007700].[/color][color=#0000bb]nextfloat[/color][color=#007700]());            if ([/color][color=#0000bb]getgiamgia[/color][color=#007700]() <= [/color][color=#0000bb]0 [/color][color=#007700]|| [/color][color=#0000bb]getgiamgia[/color][color=#007700]() >= [/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 sai. hay nhap lai"[/color][color=#007700]);        } while ([/color][color=#0000bb]getgiamgia[/color][color=#007700]() <= [/color][color=#0000bb]0 [/color][color=#007700]|| [/color][color=#0000bb]getgiamgia[/color][color=#007700]() >= [/color][color=#0000bb]1[/color][color=#007700]);        return (double) ([/color][color=#0000bb]getdongia[/color][color=#007700]() * [/color][color=#0000bb]getsoluong[/color][color=#007700]() *([/color][color=#0000bb]1 [/color][color=#007700]- [/color][color=#0000bb]getgiamgia[/color][color=#007700]()));    }}[/color] 

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import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/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]hanghoademo hhd [/color][color=#007700]= new [/color][color=#0000bb]hanghoademo[/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]hhd[/color][color=#007700].[/color][color=#0000bb]input[/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]"tien: "                [/color][color=#007700]+ [/color][color=#0000bb]hhd[/color][color=#007700].[/color][color=#0000bb]tinhtien[/color][color=#007700]([/color][color=#0000bb]hhd[/color][color=#007700].[/color][color=#0000bb]getdongia[/color][color=#007700](), [/color][color=#0000bb]hhd[/color][color=#007700].[/color][color=#0000bb]getsoluong[/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]hhd[/color][color=#007700].[/color][color=#0000bb]input[/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]"tien sau khi giam gia: "                [/color][color=#007700]+ [/color][color=#0000bb]hhd[/color][color=#007700].[/color][color=#0000bb]tinhtien[/color][color=#007700]([/color][color=#0000bb]hhd[/color][color=#007700].[/color][color=#0000bb]getdongia[/color][color=#007700](), [/color][color=#0000bb]hhd[/color][color=#007700].[/color][color=#0000bb]getsoluong[/color][color=#007700](),                        [/color][color=#0000bb]hhd[/color][color=#007700].[/color][color=#0000bb]getgiamgia[/color][color=#007700]()));    }}[/color] 

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