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  • 编一个多用户登陆程序

    package com.java.Day20161118;
    //编一个多用户登陆程序
    import java.util.*;
    public class Login {
    private static String [] names ={"user", "admin" , "manager"} ;
    private static String [] password = {"123123","asdfg","123456"};
    private static int index = -1 ;
      public static void main(String[] args) {
        Scanner input = new Scanner(System.in) ;
        do{
           System.out.println("请输入用户名:");
           String name = input.next() ;
           for (int i = 0; i < names.length; i++) {
            if (name.equals(names[i])) { //为什么用name==names[i] 就会报错 ?
            index = i ;
            break ;
              }
            }
          }while(index==-1);
          System.out.println();
          System.out.println("请输入密码:");
          int index2 = -2 ;
          int index3 = 3 ;//用来记录剩余登陆次数。
        do{
            System.out.println();
            String pass = input.next();
            System.out.println();
            if (pass.equals(password[index])) {
              System.out.println();
              System.out.println("进入主菜单!");
              index2 = -4 ;
            }else{
              index3 -- ;
              if(index3==0){
                System.out.println("输入密码有误,请明日再来登陆!");
                break ;
                }
              System.out.println("输入的密码有误,请重新输入:");
              System.out.println("您还有"+index3+"次机会!");
             }
           }while(index2 ==-2);
        }
    }

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  • 原文地址:https://www.cnblogs.com/ljwa/p/6081120.html
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