import java.util.Scanner;/** * Created by liwenj on 2017/7/17. */public class test9 {    public static void main(String[] args) {        Scanner input=new Scanner(System.in);        System.out.println("1.登录系统");        System.out.println("2.退出系统");        System.out.print("请输入数字：");        int check=input.nextInt();       switch (check){           case 1:               System.out.println("主菜单");               System.out.println("1.客户信息管理");               System.out.println("2.购物结算");               System.out.println("3.回馈");               System.out.println("4.退出");               System.out.println("请输入数字");               int op=input.nextInt();               switch (op){                   case 1:                       System.out.println("1.添加客户信息");                       System.out.println("2.修改客户信息");                       break;                   case 2:                       System.out.println("1.幸运抽奖");                       System.out.println("2.生日问候");               }               break;           case 2:               System.exit(1);//退出程序       }    }}