完善上面的SmartLock类

SmartLock 类是一个高级的锁管理器，用于简化并发控制。为了完善它，我们可以添加更多的功能，如支持超时、线程安全的获取和释放锁，以及一些错误处理机制。以下是可能的增强版本：

// SmartLock.java
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class SmartLock<T> {
    private final Lock lock;
    private final Condition notEmpty;
    private T value;
    private boolean locked;

    public SmartLock() {
        this.lock = new ReentrantLock();
        thisnotEmpty = lock.newCondition();
    }

    // 添加获取锁的方法，支持超时
    public boolean tryLock(long timeout, TimeUnit unit) throws InterruptedException {
        if (locked || !lock.tryLock(timeout, unit)) {
            return false;
        } else {
            locked = true;
            return true;
        }
    }

    // 获取锁，阻塞直到获得
    public synchronized T getLock() throws InterruptedException {
        while (!tryLock(0, TimeUnit.MILLISECONDS)) {
            wait(notEmpty);
        }
        return value;
    }

    // 释放锁
    public synchronized void releaseLock(T value) {
        if (!this.value.equals(value)) {
            throw new IllegalArgumentException("Invalid value");
        }
        this.value = null;
        notifyAll(); // 通知所有等待的线程
        locked = false;
    }

    // 设置值并释放锁，如果已锁定，则抛出异常
    public synchronized void setValue(T value) throws IllegalStateException {
        if (locked) {
            throw new IllegalStateException("Lock is already held");
        }
        this.value = value;
        releaseLock(value);
    }

    // 锁状态检查
    public synchronized boolean isLocked() {
        return locked;
    }
}