Java Condition条件等待使用方法详解

import java.util.LinkedList;
import java.util.Queue;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class BoundedQueue {
    private final Queue queue = new LinkedList<>();
    private final int capacity;
    private final Lock lock = new ReentrantLock();
    private final Condition notFull = lock.newCondition();
    private final Condition notEmpty = lock.newCondition();

    public BoundedQueue(int capacity) {
        this.capacity = capacity;
    }

    public void put(T item) throws InterruptedException {
        lock.lock();
        try {
            while (queue.size() == capacity) {
                notFull.await(); // 队列满时等待
            }
            queue.offer(item);
            notEmpty.signal(); // 通知消费者有数据
        } finally {
            lock.unlock();
        }
    }

    public T take() throws InterruptedException {
        lock.lock();
        try {
            while (queue.isEmpty()) {
                notEmpty.await(); // 队列空时等待
            }
            T item = queue.poll();
            notFull.signal(); // 通知生产者可继续添加
            return item;
        } finally {
            lock.unlock();
        }
    }
}