java方法实现简易ATM功能

package com.atm;

import java.util.Scanner;


public class Atm {  
 
  public Scanner scanner  = new Scanner(System.in);
       public  String[] cardNos= {"123","456","111"};
       public  String[] passWords= {"112","223","121"};
       public  String[] userNames= {"小张","小小","张晓"};
       public  double[] moneys = {1000,2000,3000};
   public int userIndex = 10;
   public int time=3;
   
   
       
    public static void main(String[] args) {     
      Atm atm = new  Atm();  
      
      atm.atmRun();   
    }
  
    
    public void atmRun() {       
     while(time>0) { 
      System.out.println("请输入卡号：");
      String cardNo = scanner.nextLine();
      System.out.println("请输入密码：");
      String pwd = scanner.nextLine(); 
      
      int userIndex= this.login(cardNo, pwd);
      
      if(userIndex!=10) {
      
           this.showMenu();       
      }else {
       time --;
       System.out.println("您输入的账号或密码有误");
       System.out.println("你还有"+time+"次机会");
      }
      
      if(time==0) {
       System.exit(0);
      }
     }
     
     }
    
   public int login(String cardNo,String pwd) {   
    
    for(int i=0;i<cardNos.length;i++) {
     if(cardNo.equals(cardNos[i])) {
      userIndex=i;
      break;
     }
    }
    
    if(userIndex!=10) {
     
     if(pwd.equals(passwords[userIndex])) {              
       return userIndex;   
     }else {
      userIndex=10;
     }   
    }
    return userIndex;
   }
  
    public void showMenu() { 
     time=0;
     int out=10;
     System.out.println("欢迎尊敬的VIP用户:  "+userNames[userIndex]);
     while(out==10) {
      System.out.println("请选择你的操作: 1 查询  2 取款 3 存款 4 转账 5 退出");
      int getNum=scanner.nextInt();
      switch (getNum) {
      case 1:System.out.println("您当前余额为："+moneys[userIndex]);    
     break;
     
      case 2:this.getMoneys();
       break;
     
      case 3:this.savaMoney();
      break;
      
      case 4:this.transMoneys();
      break;
      case 5:  System.out.println("退出成功！");
       out=0;
    }
     } 
    
    }   
  
  
  
  public void getMoneys() {
   System.out.println("请输入您的取款金额：");
   int getMoney=scanner.nextInt();
   if(getMoney>moneys[userIndex]) {
    System.out.println("亲亲您的余额不足哦！！！");
    System.out.println("您的余额为："+moneys[userIndex]);
   }else {
    moneys[userIndex]-=getMoney;
    System.out.println("亲恭喜您成功取款"+getMoney+"     您的余额为：  "+moneys[userIndex]);
   }
  } 
  
  public void savaMoney() {
   System.out.println("请输入您的存款金额：");
   int savaMoney=scanner.nextInt();
    moneys[userIndex]+=savaMoney;
    System.out.println("亲恭喜您成功存款"+savaMoney+"    您的余额为：  "+moneys[userIndex]);
   }
  
  public void transMoneys() {
   
   int hasUser=10;
   int transIndex=0;
   System.out.println("请输入转账的账号：");
   String transCard=scanner.next();
   for(int i=0;i<cardNos.length;i++) {
    if(transCard.equals(cardNos[i])) {
     hasUser=5;
     transIndex=i;
     break;
    }  
   }
   if(hasUser==10) {
    System.out.println("亲亲，此账号不纯在哦！！");
   }else {
    System.out.println("请输入转账金额：");
    double transMoney=scanner.nextDouble();
    if(transMoney>moneys[userIndex]) {
     System.out.println("转账失败！！");
     System.out.println("失败原因：转账金额大于余额，您的余额为："+moneys[userIndex]);
    }else {
     transCard+=transMoney;
     moneys[userIndex]-=transMoney;
     System.out.println("成功向："+userNames[transIndex]+"转账："+transMoney);
     System.out.println("您剩余金额为："+moneys[userIndex]);
    }
   }
  } 
  
 }