java 简易银行系统（数组，继承，面向对象）

￡神魔★判官ぃ 2023-10-08 12:14 30阅读 0赞

**\#\# 直接上代码**

银行Bank类

package com.qf.day12.t1.bank;
    import java.util.Scanner;
    
    public class Bank {
        
    	int size = 4;
        Scanner input = new Scanner(System.in);	
    	User[] users = new User[5];//存储所有银行用户信息
    	/*
    	 * 初始化信息
    	 */
    	public void initial() {
        
    		
    		User user = new User();
    		user.setCardNo("6222020200001234567");
    		user.setPassword("123456");
    		user.setUsername("tom");
    		user.setPhone("12345676561");
    		user.setIdentityCard("371425199812760982");
    		user.setBalance(1000.0);
    		
    		users[0] = user;
    		User user2 = new User("6222020200001234667","123456","mary","12345676569","371425199812760999",3999.0);
    		users[1] = user2;
    		
    		users[2] = new User("6222020200001234999","123456","my","12345676560","371425199812760988",9999.0);
    		users[3] = new User("6222020200001234888","123456","tank","12345676555","37142519981276666",8999.0);
    		users[4] = new User("6222020200001234111","123456","heeby","12345676444","371425199812760222",4999.0);
    		
    	}
    	/*
    	 * 欢迎页菜单
    	 */
    	public void welcomeMenu() {
        
    		System.out.println("**************欢迎使用ATM自动银行系统************************");
    		System.out.println("1,开户   ，2，登录");
    		System.out.println("请输入操作编号：");
    		int choice = input.nextInt();
    		switch(choice) {
        
    		case 1:
    			System.out.println("执行开户");
    			this.showall();
    			this.register();
    			this.showall();
    			break;
    		case 2:
    			this.login();//调用登录
    			break;
    		}
    	}
    	/*
    	 * 输入用户名密码登录
    	 */
    	public void login() {
        
    		//用户输入卡号，密码
    		System.out.println("请输入卡号：");
    		String no = input.next();
    		System.out.println("请输入密码：");
    		String pwd = input.next();
    		User myAccount = this.check(no,pwd);
    		if(myAccount != null) {
        
    			System.out.println("登陆成功");
    			this.showMenu(myAccount);
    		}else {
        
    			System.out.println("卡号或密码错误");
    		}
    	}
    	/*
    	 * 验证用户名密码
    	 */
    	public User check(String no, String pwd) {
        
    		//验证卡密与开户时一致
    		for(int i = 0 ; i < users.length; i++) {
        
    			if(users[i] != null) {
        //非空判断
    				if(no.equals(users[i].getCardNo()) && pwd.equals(users[i].getPassword())) {
        
    					//System.out.println("登陆成功！欢迎您" + users[i].getUsername());
    					//记录登录成功用户
    					return users[i];//查找到与账号密码匹配的账号
    				}
    			}
    		}
    		return null;
    	}
    	/*
    	 * 开户功能
    	 */
    	public void register() {
        
    		//做数组长度判断，是否扩容
    		if(users.length == size) {
        
    			User[] newNums = new User [users.length*2];
    			System.arraycopy(users, 0 , newNums, 0 , users.length);
    			//地址的替换（数组是引用数据类型）
    			users = newNums;
    		}
    		System.out.println("请输入密码");
    		String pwd = input.next();
    		System.out.println("请输入姓名");
    		String name = input.next();
    		System.out.println("请输入身份证号");
    		String id = input.next();
    		System.out.println("请输入电话");
    		String phone = input.next();
    		//生成卡号
    		//固定前缀（622202020000）+自动生成7位数
    		String prefix = "622202020000";
    		int suffix = (int)(Math.random()*1000000) +1000000;
    		String no = prefix + suffix;//生成卡号
    		User user = new User();
    		user.setCardNo(no);
    		user.setIdentityCard(id);
    		user.setPassword(pwd);
    		user.setPhone(phone);
    		user.setUsername(name);
    		
    		users[size] = user;
    		size++;
    	}
    	/*
    	 * 取款功能
    	 */
    	public void getMoney(User myAccount) {
        
    		System.out.println("取款功能操作中.......");
    		System.out.println("输入取款金额：.");
    		double money = input.nextDouble();
    		if(money > 0 && money < myAccount.getBalance()) {
        
    			double currentBalance = myAccount.getBalance() - money;
    			myAccount.setBalance(currentBalance);
    			System.out.println("取款成功。当前余额为："+myAccount.getBalance());
    		}else {
        
    			System.out.println("余额不足！");
    		}	
    	}
    	/*
    	 * 存款功能
    	 */
    	public void setMoney(User myAccount) {
        
    		System.out.println("存款功能操作中.......");
    		System.out.println("输入存款金额：.");
    		double money = input.nextDouble();
    		if(money > 0) {
        
    			double currentBalance = myAccount.getBalance() + money;
    			myAccount.setBalance(currentBalance);
    			System.out.println("存款成功。当前余额为："+myAccount.getBalance());
    		}else {
        
    			System.out.println("输入有误！");
    		}	
    	}
    	/*
    	 * 转账功能
    	 */
    	public void giveMoney(User myAccount) {
        
    		//判断对方卡号姓名
    		System.out.println("输入对方卡号：.");
    		String youcard = input.next();
    		System.out.println("输入对方卡号：.");
    		String youname = input.next();
    		User toUser = this.checkToAccount(youcard,youname);
    		//输入金额，判断自己余额
    		if(toUser != null) {
        
    			System.out.println("输入转账金额");
    			double givemoney = input.nextDouble();
    			if(givemoney > 0 && givemoney <= myAccount.getBalance()) {
        
    				double newBalance = myAccount.getBalance() - givemoney;
    				double newBalanceto = toUser.getBalance() + givemoney;
    				myAccount.setBalance(newBalance);
    				toUser.setBalance(newBalanceto);
    				System.out.println("转账成功。当前余额为："+myAccount.getBalance());
    			}
    		}else {
        
    			System.out.println("未找到对方账户");
    		}
    		//双方余额数量变化
    	}
        public User checkToAccount(String youcard , String youname) {
        
        	//验证卡密与开户时一致
        		for(int i = 0 ; i < users.length; i++) {
        
        			if(users[i] != null) {
        //非空判断
        				if(youcard.equals(users[i].getCardNo()) && youname.equals(users[i].getUsername())) {
        
        					//System.out.println("登陆成功！欢迎您" + users[i].getUsername());
        					//记录登录成功用户
        					return users[i];//查找到与账号密码匹配的账号
        				}
        			}
        		}
        	return null;
    	}
    	/*
    	 * 查询余额功能
    	 */
    	public void lookMoney(User myAccount) {
        
    		System.out.println("查询余额功能操作中.......");
    		System.out.println("查询成功。当前余额为："+myAccount.getBalance());		
    	}
    	/*
    	 *修改密码功能
    	 */
    	public void updatePassword(User myAccount) {
        
    		System.out.println("修改密码功能操作中.......");
    		String oldpassword,newpassword,newpassword2;
    		do {
        
    			System.out.println("输入旧密码：.");
    			oldpassword = input.next();
    			if(!oldpassword.equals(myAccount.getPassword())) {
        
    				System.out.println("旧密码输入错误，请重试");
    		}}while(!oldpassword.equals(myAccount.getPassword()));
    		do {
        
    			System.out.println("输入新密码：.");
    			newpassword = input.next();
    			System.out.println("再输一次：.");
    			newpassword2 = input.next();
    			if(!newpassword.equals(newpassword2)) {
        
    				System.out.println("两次密码输入不一致，请重试");
    			}	
    		}while(!newpassword.equals(newpassword2));
    		
    		myAccount.setPassword(newpassword);
    		System.out.println("修改成功，当前密码"+myAccount.getPassword());	
    	}
    	/*
    	 *修改预留手机号功能
    	 */
    	public void updatePhone(User myAccount) {
        
    		System.out.println("修改预留手机号功能操作中.......");
    		System.out.println("输入新手机号码：.");
    		String newphone = input.next();
    		myAccount.setPhone(newphone);
    		System.out.println("修改成功。当前预留手机号为："+myAccount.getPhone());	
    	}
    	/*
    	 *注销账户功能
    	 */
    	public void delete(User myAccount) {
        
    		int position = findmyaccount(myAccount);
    		
    		if(position < 0||position >size){
        
    			System.out.println("非法位置，稍后重试。。。");
    			return ;//含义编码（没有对应下标）
    		}		
    		//1,目标位置后一个值，前移一个（多次循环，直至所有有效值移动完毕）
    		for(int i = position; i < size - 1; i++){
        
    			users[i] = users[i+1];		
    		}
    		//2,有效值--
    		size--;
    	}
    	/*
    	 * 展示业务菜单
    	 */
    	public void showMenu(User myAccount) {
        
    		int choice;
    		while(true){
        
    			Scanner input = new Scanner(System.in);
    			System.out.println("----------------欢迎使用ATM自动银行系统----------------------------");
    			System.out.println("2，存款  3，取款  4，转账  5，查询余额   6，修改密码 7，修改预留手机号  8，注销账户    0，退出 ");
    			System.out.println("------------------------------------");
    			System.out.println("请输入操作编号");
    			choice = input.nextInt();
    			switch(choice) {
        
    			case 2:
    				System.out.println("执行存款");
    				this.setMoney(myAccount);
    				break;
    			case 3:
    				System.out.println("执行取款");
    				this.getMoney(myAccount);
    				break;
    			case 4:
    				System.out.println("执行转账");
    				this.giveMoney(myAccount);
    				break;
    			case 5:
    				System.out.println("执行查询余额");
    				this.lookMoney(myAccount);
    				break;
    			case 6:
    				System.out.println("执行修改密码");
    				this.updatePassword(myAccount);
    				break;
    			case 7:
    				System.out.println("执行修改预留手机号");
    				this.updatePhone(myAccount);
    				break;
    			case 8:
    				System.out.println("执行注销账户");
    				this.delete(myAccount);
    				break;
    			case 0:
    				System.out.println("执行退出");
    				return;//退出整个方法
    			default:
    				System.out.println("输入有误，请重新输入");
    			}
    		}	
    	}
    
    	public int findmyaccount(User myAccount) {
        
    		int position=0;
    		for(int i = 0 ; i < users.length; i++) {
        
    			if(myAccount.getCardNo().equals(users[i].getCardNo())) {
        
    				position = i;
    			}
    		}
    		return position;
    	}
    	public void showall() {
        
    		for(int i = 0 ; i < size; i++) {
        
    			System.out.println(users[i].getCardNo()+"\t"+users[i].getUsername()+"\t"+users[i].getBalance());
    		}
    	}
    }

测试类TestBank

package com.qf.day12.t1.bank;
    /*
     * 测试类
     */
    public class TestBank {
        
    
    	public static void main(String[] args) {
        
    		//0，完成过开户工作（卡号，密码，姓名，身份证号，电话号，余额）
    		//1,输入卡号，输入密码
    		//2，卡密校验，成功展示下菜单，失败重输
    		//3，显示菜单，完成业务编号选择
    		//4，完成具体业务操作
    		
    		//程序起始
    		Bank bank = new Bank();
    		
    //		User user = null;//对象类型的变量中没有指向一个具体存在的地址，而保存了一个null值
    //		System.out.print(user.getCardNo());
    				
    		bank.initial();//初始化信息
    		bank.welcomeMenu();//用户登录
    		//bank.showMenu();
    		
    //	   outer:for(int i = 0; i < 5; i++) {
        
    //		   System.out.println("当前值："+i);
    //		   switch(i) {
        
    //		   case 3:
    //			   System.out.print("满足条件，请退出");
    //			   break;
    //		   }
    //	   }
    	}
    }

用户类User

package com.qf.day12.t1.bank;
    /*
     * 用户类
     * 存储用户相关信息
     */
    public class User {
        
    	private String cardNo;
    	private String password;
    	private String username;
    	private String identityCard;
    	private String phone;
    	private double balance;
    	
    	public User() {
        }
    	
    	public User(String cardNo,String password, String username, String identityCard, String phone, double balance) {
        
    		this.cardNo = cardNo;
    		this.password = password;
    		this.username = username;
    		this.identityCard = identityCard;
    		this.phone = phone;
    		this.balance = balance;
    	}
    	
    	public String getCardNo() {
        
    		return cardNo;
    	}
    	public void setCardNo(String cardNo) {
        
    		this.cardNo = cardNo;
    	}
    	public String getPassword() {
        
    		return password;
    	}
    	public void setPassword(String password) {
        
    		this.password = password;
    	}
    	public String getUsername() {
        
    		return username;
    	}
    	public void setUsername(String username) {
        
    		this.username = username;
    	}
    	public String getIdentityCard() {
        
    		return identityCard;
    	}
    	public void setIdentityCard(String identityCard) {
        
    		this.identityCard = identityCard;
    	}
    	public String getPhone() {
        
    		return phone;
    	}
    	public void setPhone(String phone) {
        
    		this.phone = phone;
    	}
    	public double getBalance() {
        
    		return balance;
    	}
    	public void setBalance(double balance) {
        
    		this.balance = balance;
    	}
    }