模拟ATM机

import java.io.*;
//银行卡类
class BankCard
{
	//属性和行为：

	//属性 即本类有什么？
	//卡号
	private String id;
	//密码
	private String pwd;
	//真实姓名
	private String name;
	//钱数
	private float money;

	BankCard(String id,String pwd,String name,float money)
	{
		this.id = id;
		this.pwd = pwd;
		this.name = name;
		this.money = money;
	}
	//功能
	//获取卡号
	public String getId()
	{
		return id;
	}

	//获取密码
	public String getPwd()
	{
		return pwd;
	}
	//设置密码
	public void setPwd(String newPwd)
	{
		pwd = newPwd;
	}

	//获取真实姓名
	public String getName()
	{
		return name;
	}

	//获取钱数
	public float getMoney()
	{
		return money;
	}
	//设置钱数
	public void setMoney(float myMoney)
	{
		money += myMoney;
	}

	public String toString()
	{
		return "帐号:"+id+" 户主:"+name+" 余额:"+money;
	}
};

//ATM机类
class ATM
{
	//数据库链接
	static DataBase db =  new DataBase();
	//键盘读写流
	public BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	//属性:
	//插卡口
	private BankCard bc;

	//功能
	//插卡
	public void insertCard(BankCard bc) throws Exception
	{
		this.bc = bc;
		welcome();
	}

	//欢迎界面
	public void welcome() throws Exception
	{
		String s = "******************************************";
		System.out.println(s+"\n\t欢迎使用IBM-ATM模拟系统\n"+s);
		login();
	}

	//登录界面
	public void login() throws Exception
	{


		String pwd = null;
		int count = 0;
		do
		{
			//验证用户密码
			System.out.println("请输入您的密码:");
			pwd = br.readLine();
			if(pwd.equals(bc.getPwd()))
			{
				//验证成功转至操作界面
				oparator();
				break;
			}
			else
			{
				if(count!=2)
				{
					System.out.println("您输入的密码不正确！请重新输入！");
				}
				count++;
			}
		}
		while (count<3);

		if(count==3)
		{
			lock();
		}
		else
		{
			oparator();
		}

	}

	//操作界面
	public void oparator() throws Exception
	{
		System.out.println("请选择操作类型:(其他键退出)\n"
							+"1.>取钱\n"
							+"2.>存钱\n"
							+"3.>查询\n"
							+"4.>修改密码\n"
							+"5.>转账\n"
							+"6.>退卡");
		String select = br.readLine();
		char type;
		if(!select.equals(""))
		{
			type = select.charAt(0);
		}
		else
		{
			type = '\0';
		}
		switch(type)
		{
			case '1':
			{
				blance();
				oparator();
				break;
			}
			case '2':
			{
				setMoney();
				oparator();
				break;
			}
			case '3':
			{
				query();
				oparator();
				break;
			}
			case '4':
			{
				setPwd();
				oparator();
				break;
			}
			case '5':
			{
				turn();
				oparator();
				break;
			}
			case '6':
			{
				exit();
				break;
			}
			default:
			{
				exit();
			}
		}

	}

	//取钱
	public void blance() throws Exception
	{
		System.out.println("请输入取钱金额:");
		int money = Integer.parseInt(br.readLine());

		if(money<bc.getMoney())
		{
			bc.setMoney(-money);
			System.out.println("请收好您的钱！");
			query();
		}
		else
		{
			System.out.println("余额不足！");
		}
	}

	//存钱
	public void setMoney() throws Exception
	{
		System.out.println("请输入存钱金额:");
		float money = Float.parseFloat(br.readLine());

		if(money>0)
		{
			bc.setMoney(money);
			System.out.println("您的钱已存入！");
			query();
		}
		else
		{
			System.out.println("请正确输入您要存的钱数！");
		}
	}

	//查询
	public void query()
	{
		System.out.println("用户姓名:"+bc.getName());
		System.out.println("余额:"+bc.getMoney());
	}

	//修改密码
	public void setPwd() throws Exception
	{
		String pwd = null;
		int count = 0;

		do
		{
			System.out.println("请输入旧密码:");
			pwd = br.readLine();
			if(pwd.equals(bc.getPwd()))
			{
				do
				{
					System.out.println("请输入新密码:");
					String pwd1 = br.readLine();
					System.out.println("请再次输入新密码:");
					String pwd2 = br.readLine();

					if(pwd1.equals(pwd2))
					{
						bc.setPwd(pwd2);
						System.out.println("密码修改成功！请使用新密码！");
						oparator();
					}
					else
					{
						System.out.println("两次密码输入不一致，请重新输入！");
					}
				}
				while (true);
			}
			else
			{
				System.out.println("密码验证出错!");
				count++;
			}
		}
		while (count<3);
		lock();
	}

	//转账
	public void turn() throws Exception
	{
		System.out.println("请输入转入帐号:");
		String id = br.readLine();
		if(!id.equals(bc.getId()))
		{
			BankCard turn = db.query(id);
			if(turn!=null)
			{
				System.out.println("转入帐号:"+turn.getId());
				System.out.println("户主:"+turn.getName());

				System.out.println("确认转账?y-确定 其他键-返回操作界面");

				String ok = br.readLine();
				if(ok.equals("y"))
				{
					System.out.println("请输入转账金额:");
					float money = Float.parseFloat(br.readLine());
					if(money<bc.getMoney())
					{
						bc.setMoney(-money);
						turn.setMoney(money);
						System.out.println("转账成功！");
						System.out.println(db);
					}
					else
					{
						System.out.println("余额不足！不能转账！");
					}
				}

			}
			else
			{
				System.out.println("转入帐号不存在！");
			}
		}
		else
		{
			System.out.println("不能为自己转账！");
		}
	}

	//退卡
	public void exit()
	{
		System.out.println("谢谢使用！再会！");
		System.exit(0);
	}
	//吞卡
	public void lock()
	{
		System.out.println("您操作失误次数过多,卡片暂时由我们保管!请即时和我们联系!");
		System.exit(1);
	}
};

class ATMTest
{
	public static void main(String[] args) throws Exception
	{
		BankCard bc1 = new BankCard("001","123456","李四",100000);
		BankCard bc2 = new BankCard("002","123456","王五",100000);
		BankCard bc3 = new BankCard("003","123456","麻子",100000);
		BankCard bc4 = new BankCard("004","123456","李毅",100000);
		BankCard bc5 = new BankCard("005","123456","王三",100000);
		BankCard bc6 = new BankCard("006","123456","杨怡",100000);
		BankCard bc7 = new BankCard("008","123456","刘华",100000);
		BankCard bc8 = new BankCard("010","123456","何新",100000);
		BankCard bc9 = new BankCard("013","123456","无名",100000);
		BankCard bc0 = new BankCard("007","123456","邦德",100000);
		DataBase db =  new DataBase();
		db.add(bc0);
		db.add(bc1);
		db.add(bc2);
		db.add(bc3);
		db.add(bc4);
		db.add(bc5);
		db.add(bc6);
		db.add(bc7);
		db.add(bc8);
		db.add(bc9);
		ATM atm = new ATM();
		atm.insertCard(bc0);

	}
};

class DataBase
{
	private static BankCard[] cards = new BankCard[10];
	static int count;

	public void add(BankCard bc)
	{
		cards[count] = bc;
		count++;
	}

	public BankCard query(String id)
	{
		BankCard bc = null;
		for(int i=0;i<cards.length;i++)
		{
			if(id.equals(cards[i].getId()))
			{
				bc = cards[i];
				break;
			}
		}
		return bc;
	}

	public String toString()
	{
		String message = "";
		for(int i=0;i<cards.length;i++)
		{
			message += cards[i]+"\n";
		}
		return message;
	}
};