public class ATM {

public static void main(String[] args) {

// 开立帐号

Account account = new Account();

// 在 account 中存 10,000 元

account.setBalance(10000);

// 检查 account 中的存款

System.out.println("帐户原始金额 : " + account.getBalance() + " 元");

// 小明, 小华与小英一起对 account 进行提款的动作

WithDraw s1 = new WithDraw("小明", account, 5000); // 小明 在 account 中提 5000 元

WithDraw s2 = new WithDraw("小华", account, 2000); // 小华 在 account 中提 2000 元

WithDraw s3 = new WithDraw("小英", account, 4000); // 小英 在 account 中提 4000 元

s1.start();

s2.start();

s3.start();

}

}

//帐户

class Account {

private int balance; // 帐户馀额

public int getBalance() { // 取得帐户馀额

return balance;

}

public void setBalance(int money) { // 设定帐户馀额

balance = money;

}

// 提款方法

public void withDraw(Account account, int withdrawMoney) {

String tName = Thread.currentThread().getName(); // tName=提款人

System.out.println(tName + " 开始提款 ... ");

boolean withDrawStatus; // 提款状态 说明:false=提款失败, true=提款成功

synchronized(ATM.class) {

int tmpBalabce = account.getBalance(); // 取得最新帐户馀额

//用 for-loop 模拟提款时系统所花的时间

for(double delay=0;delay<99999999;delay++) {

// ... 提款进行中 ...

}

tmpBalabce = tmpBalabce - withdrawMoney; // 最新帐户馀额 - 欲提款金额 (用来判断是否馀额足够的依据)

if (tmpBalabce < 0) { // 判断是否馀额足够

withDrawStatus = false;

System.out.println("....................");

System.out.println(" 帐户馀额不足！");

System.out.println("....................");

} else {

withDrawStatus = true;

account.setBalance(tmpBalabce); // 回存account最後剩馀金额

}

}

System.out.println(tName + "的交易单:");

System.out.println("\t欲提款金额：" + withdrawMoney + "元");

System.out.println("\t帐户馀额：" + account.getBalance());

if(withDrawStatus == true){

System.out.println(tName + " 完成提款 ... ");

} else {

System.out.println(tName + " 提款失败 ... ");

}

System.out.println("-------------------------------");

}

}

// 提款类别

class WithDraw extends Thread {

private Account account; // 帐号

private int withdrawMoney; // 欲提款的金额

// tName:执行绪名称, account:Account物件名称, withdrawMoney:欲提款金额

public WithDraw(String tName, Account account, int withdrawMoney) {

setName(tName);

this.account = account;

this.withdrawMoney= withdrawMoney;

}

public void run() {

// 执行提款动作(account:帐号, withdrawMoney 欲提款金额)

account.withDraw(account, withdrawMoney); // 执行提款动作

}

}

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