商城带登陆批发演示

// 商品批发城import java.util.Scanner;public class ShangCheng {String[] Goods = {"电风扇","洗衣机","电视机","冰箱","空调机"};double[] Prices = {124.23,4500.0,8800.9,5000.88,4456.0};public static void main(String[] args){Login();ShowPro();PiFa();}// 登陆模块public static void Login(){Scanner input = new Scanner(System.in);while(true){System.out.print("请输入用户名：");String User = input.next();System.out.print("请输入密码：");String PassWord = input.next();if (!User.equalsIgnoreCase("Tom") || !PassWord.equals("123")){System.out.println("用户名或密码错误，请重新输入！");} else {System.out.println("登陆成功！");break;}}}// 产品信息显示模块public static void ShowPro(){ShangCheng s = new ShangCheng();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<s.Goods.length; i++){System.out.println("\t" + (i+1) + "\t" + s.Goods[i] + "\t" + s.Prices[i]);}System.out.println("**************************************");}// 批发商品public static void PiFa(){ShangCheng s = new ShangCheng();int ProId;int ProAmount;double Sum = 0;StringBuffer Total;while(true){ProId = CheckIsNumber("请输入您批发的商品编号：");if(ProId > s.Goods.length || ProId < 1){System.out.println("输入的编号超出商品编号范围！");continue;} break;}ProAmount = CheckIsNumber("请输入批发的数量:");for(int i=0; i<s.Goods.length; i++){if (ProId == (i+1)){Sum = s.Prices[i]*ProAmount;}} Total = new StringBuffer(String.valueOf(Sum));  for(int i=Total.indexOf(".")-3; i>0; i=i-3){ Total.insert(i, ','); }System.out.print("您需要付款：" + Total);}// 判断输入的是否是数字public static int CheckIsNumber(String str){Scanner input = new Scanner(System.in);int num;while(true){System.out.print(str);if (input.hasNextInt()){num = input.nextInt();break;} else {input.next();System.out.println("请输入整数！");}}return num;}}