第十五章上机练习4

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package cn.第十五章上级题;import java.util.Scanner;public class Shangjilianxi4 {double qian;String []goods=new String []{"电风扇","洗衣机","电视机","冰箱","空调机"};double[]price=new double[]{124.23,4500,8800.90,5000.88,4456,12000.46};public boolean login(){boolean flag=false;Scanner input=new Scanner(System.in);System.out.println("请输入用户名");String name=input.next();System.out.println("请输入密码");String pass=input.next();if(name.equals("TOM")&&pass.equals("123")){System.out.println("登录成功!");show();flag=true;}else {System.out.println("登录失败!");}return flag;}public void show(){System.out.println("**********欢迎进入商品批发城******");System.out.println("编号\t商品\t价格\t");for (int i = 0; i < goods.length; i++) {System.out.print("\n"+(i+1));System.out.print("\t"+goods[i]);System.out.print("\t"+change(price[i]));}}public StringBuffer change(double d){StringBuffer str=new StringBuffer(String.valueOf(d));for(int i=str.indexOf(".")-3;i>0;i=i-3){str.insert(i,',');}return str;}public static void main(String[] args) {double[]price=new double[]{124.23,4500,8800.90,5000.88,4456,12000.46};Scanner input=new Scanner(System.in);Shangjilianxi4 a=new Shangjilianxi4();a.login();System.out.print("\n请输入您批发是商品编号:");int bh=input.nextInt();System.out.print("请输入批发数量:");int shu=input.nextInt();/*switch(bh){case 1:    a.qian=124.23*shu;break;case 2:a.qian=4500*shu;break;case 3:a.qian=8800.90*shu;break;case 4:a.qian=5000.88*shu;break;case 5:a.qian=4456*shu;break;}*/double zong=price[bh-1]*shu;StringBuffer q=a.change(zong);System.out.println("你需要付款:"+a.change(zong));}}
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