java写简易ATM
本文需求:用java写一个简易ATM,
功能:有登陆,有查询资金功能,有存款功能,有取款功能,有转账功能,有退出;
技术需求:会java一维数组及流程判断
代码如下:
package com.smallzz.atm;
import java.util.Scanner;
public class Atm {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
String[] cardNum= {"123","456","111"};
String[] pwdNum= {"112","223","343"};
String[] user= {"小张","小李","小小"};
double[] money= {18999.0,4990.0,20000.0};
/**
* 注:time为密码输入次数,indexO用于判断账号是否存在若为20则为不存在,
* indexO2用于判断转账卡号是否存在若为20则为不存在,
* out为是否结束循环功能菜单,当out为20时则循环,其他为退出
*
* */
int time=3;
int indexO=20;
int indexO2=20;
int out=20;
do {
System.out.println("请输入您的卡号");
String card = scanner.nextLine();
/**账号是否存在*/
for(int i=0;i<cardNum.length;i++) {
if(card.equals(cardNum[i])) {
indexO=i;
break;
}
}
/**账号存在*/
if(indexO!=20) {
System.out.println("欢饮您:"+user[indexO]);
System.out.println("请输入您的密码:");
String pwd = scanner.nextLine();
if(pwd.equals(pwdNum[indexO])) {
System.out.println("登录成功!!");
/**循环功能菜单*/
while (out==20) {
System.out.println("请选择服务项目:1.查询,2.存款,3.取款,4.转账,5.退出");
int num=scanner.nextInt();
switch (num) {
case 1: System.out.println(money[indexO]);
break;
case 2:System.out.println("请输入您的存款金额:");
int saveMoney=scanner.nextInt();
money[indexO]+=saveMoney;
System.out.println("存款成功!!");
System.out.println("您的余额为:"+money[indexO]);
break;
case 3:System.out.println("请输入您的取款金额:");
int getMoney=scanner.nextInt();
if(getMoney>money[indexO]) {
System.out.println("当前余额不足!!");
}else {
money[indexO]-=getMoney;
System.out.println("取款成功!!");
System.out.println("您的余额为:"+money[indexO]);
}
break;
case 4:System.out.println("请输入转账卡号:");
String qq = scanner.nextLine();
String zhuanCard=scanner.nextLine();
/**账号是否存在*/
for(int j=0;j<cardNum.length;j++) {
if(zhuanCard.equals(cardNum[j])) {
indexO2=j;
break;
}
}
/**存在*/
if(indexO2!=20) {
System.out.println("请输入您的转账金额:");
int zhuanMoney=scanner.nextInt();
if(zhuanMoney>money[indexO]) {
System.out.println("余额不足!!");
}else {
money[indexO]-=zhuanMoney;
money[indexO2]+=zhuanMoney;
System.out.println("成功向:"+user[indexO2]+"转账:"+zhuanMoney);
System.out.println("您的余额为:"+money[indexO]);
}
}else {
System.out.println("此账号不存在!!");
}
break;
case 5:out=5;
System.out.println("退出成功!!");
break;
}
}
time=0;
}else {
time--;
System.out.println("密码输入有误,请重新输入:");
System.out.println("您剩余:"+time+"次机会");
}
}
} while (time>0);
}
}