假设某家银行可接受顾客的取款和存款，每次进行一次取款或存款，便可计算出账户的总额。现有一个账户余额2000元，两名顾客每人分4次，每次取款100元。另有两名顾客每人分3次，每次存入100元。试编程通过多线程来模拟顾客的取款和存款操作。JAVA实现

### 回答1：
以下是一个简单的Java多线程模拟银行账户取款和存款操作的代码：

public class BankAccount {
    private int balance;  // 银行账户余额

    public BankAccount(int balance) {
        this.balance = balance;
    }

    public synchronized void deposit(int amount) {
        balance += amount;
        System.out.println("Deposit: " + amount + ", Balance: " + balance);
    }

    public synchronized void withdraw(int amount) {
        if (balance < amount) {
            System.out.println("Insufficient balance!");
        } else {
            balance -= amount;
            System.out.println("Withdrawal: " + amount + ", Balance: " + balance);
        }
    }

    public static void main(String[] args) {
        BankAccount account = new BankAccount(2000);
        Thread[] threads = new Thread[4];
        // 模拟4个顾客每人分4次取款
        for (int i = 0; i < 4; i++) {
            threads[i] = new Thread(() -> {
                for (int j = 0; j < 4; j++) {
                    account.withdraw(100);
                }
            });
            threads[i].start();
        }
        // 模拟2个顾客每人分3次存款
        for (int i = 0; i < 2; i++) {
            threads[i] = new Thread(() -> {
                for (int j = 0; j < 3; j++) {
                    account.deposit(100);
                }
            });
            threads[i].start();
        }
        // 等待所有线程执行完毕
        for (int i = 0; i < threads.length; i++) {
            try {
                threads[i].join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

在上述代码中，我们使用了Java的synchronized关键字来确保取款和存款操作的原子性，避免多个线程同时修改银行账户余额导致数据不一致的问题。同时，我们创建了4个线程来模拟4个顾客每人分4次取款，以及2个线程来模拟2个顾客每人分3次存款。最后，我们使用join()方法等待所有线程执行完毕，确保输出结果的正确性。

### 回答2：
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class BankingSimulation {
private static int balance = 2000;
private static Lock lock = new ReentrantLock();

public static void main(String[] args) {
CustomerWithdrawer customerWithdrawer1 = new CustomerWithdrawer("顾客1", 4);
CustomerWithdrawer customerWithdrawer2 = new CustomerWithdrawer("顾客2", 4);
CustomerDepositor customerDepositor1 = new CustomerDepositor("顾客3", 3);
CustomerDepositor customerDepositor2 = new CustomerDepositor("顾客4", 3);

Thread thread1 = new Thread(customerWithdrawer1);
Thread thread2 = new Thread(customerWithdrawer2);
Thread thread3 = new Thread(customerDepositor1);
Thread thread4 = new Thread(customerDepositor2);

thread1.start();
thread2.start();
thread3.start();
thread4.start();

try {
thread1.join();
thread2.join();
thread3.join();
thread4.join();
} catch (InterruptedException e) {
e.printStackTrace();
}

System.out.println("账户最终余额：" + balance);
}

static void withdraw(int amount) {
lock.lock();
try {
if (balance >= amount) {
balance -= amount;
System.out.println(Thread.currentThread().getName() + " 取款 " + amount + " 元");
} else {
System.out.println(Thread.currentThread().getName() + " 余额不足");
}
} finally {
lock.unlock();
}
}

static void deposit(int amount) {
lock.lock();
try {
balance += amount;
System.out.println(Thread.currentThread().getName() + " 存款 " + amount + " 元");
} finally {
lock.unlock();
}
}

static class CustomerWithdrawer implements Runnable {
private String name;
private int repeat;

CustomerWithdrawer(String name, int repeat) {
this.name = name;
this.repeat = repeat;
}

@Override
public void run() {
for (int i = 0; i < repeat; i++) {
withdraw(100);
}
}
}

static class CustomerDepositor implements Runnable {
private String name;
private int repeat;

CustomerDepositor(String name, int repeat) {
this.name = name;
this.repeat = repeat;
}

@Override
public void run() {
for (int i = 0; i < repeat; i++) {
deposit(100);
}
}
}
}

### 回答3：
下面是一个使用Java多线程模拟顾客取款和存款操作的示例代码：

public class Bank {
    private int balance = 2000; // 初始账户余额

    // 同步方法，用于取款操作
    public synchronized void withdraw(int amount) {
        // 检查是否有足够的余额进行取款
        if (balance >= amount) {
            System.out.println(Thread.currentThread().getName() + "正在取款 " + amount + " 元");
            balance -= amount;
            System.out.println("账户余额：" + balance + " 元");
        } else {
            System.out.println(Thread.currentThread().getName() + "尝试取款 " + amount + " 元，余额不足");
        }
    }

    // 同步方法，用于存款操作
    public synchronized void deposit(int amount) {
        System.out.println(Thread.currentThread().getName() + "正在存款 " + amount + " 元");
        balance += amount;
        System.out.println("账户余额：" + balance + " 元");
    }

    public static void main(String[] args) {
        Bank bank = new Bank();

        // 创建四个线程代表四个顾客
        Thread customer1 = new Thread(() -> {
            for (int i = 0; i < 4; i++) {
                bank.withdraw(100);
            }
        });

        Thread customer2 = new Thread(() -> {
            for (int i = 0; i < 4; i++) {
                bank.withdraw(100);
            }
        });

        Thread customer3 = new Thread(() -> {
            for (int i = 0; i < 3; i++) {
                bank.deposit(100);
            }
        });

        Thread customer4 = new Thread(() -> {
            for (int i = 0; i < 3; i++) {
                bank.deposit(100);
            }
        });

        // 启动四个顾客线程
        customer1.start();
        customer2.start();
        customer3.start();
        customer4.start();
    }
}

这个示例代码中，Bank类代表一个银行，其中包含两个同步方法withdraw（用于取款）和deposit（用于存款），通过synchronized关键字来确保线程安全。四个顾客分别通过多线程进行取款和存款操作。