十四章上机练习4

来源：互联网发布：网络与系统攻击技术编辑：程序博客网时间：2024/04/30 22:57
import java.util.*;public class Goods {    String[] goods=new String[]{"电风扇","洗衣机","电视机","冰箱","空调机"};    double[] price=new double[]{124.23,4500,8800.90,5000.88,4456,1200.46};       double total;    public boolean login(){    boolean flag=false;    Scanner input=new Scanner(System.in);    System.out.print("请输入用户名: ");    String name=input.next();    System.out.print("请输入密码: ");    String pwd=input.next();    if(name.equals("Tom")&&pwd.equals("123")){    System.out.println("登录成功");    flag=true;    }else{    System.out.println("请重新登录");        }    return flag;    }     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 void show(){    Scanner input=new Scanner(System.in);    System.out.println("*********欢迎进入商品批发城*********");    System.out.println("\t编号\t商品\t价格");    for(int i=0;i<goods.length;i++){    System.out.println("\t"+(i+1)+"\t"+goods[i]+"\t"+change(price[i]));    }    System.out.println("************************************");    System.out.print("请输入您批发的商品编号: ");    int choice=input.nextInt();    System.out.print("请输入批发数量: ");    int number=input.nextInt();    switch(choice){    case 1:    total=price[0]*number;    break;    case 2:    total=price[1]*number;    break;    case 3:    total=price[2]*number;    break;    case 4:    total=price[3]*number;    break;    case 5:    total=price[4]*number;    break;    }    System.out.println("您需要付款:"+change(total));    }               public static void main(String[] args) {    Goods g=new Goods();        g.login();    g.show();}}
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