在线程之间共享事务范围

import java.util.concurrent.locks.ReentrantLock;

public class TransactionScopeExample {
    private ReentrantLock lock = new ReentrantLock();
    private int balance = 100;

    public void transfer(int amount) {
        lock.lock();
        try {
            if (balance >= amount) {
                balance -= amount;
                // 执行其他操作
            } else {
                throw new RuntimeException("Insufficient balance");
            }
        } finally {
            lock.unlock();
        }
    }
}