多线程学习笔记九——实现有界队列

最新推荐文章于 2025-09-24 01:28:42 发布

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#多线程 #有界队列

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本文介绍了一个基于Java的简单阻塞队列实现。该队列使用ReentrantLock和Condition来确保线程间的同步，并在队列满或空时等待。通过示例展示了如何在多线程环境中进行元素的添加和移除操作。

package day2;

import java.util.LinkedList;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.ReentrantLock;

public class BlockingQueue {
    private ReentrantLock lock = new ReentrantLock();
    private Condition notFull = lock.newCondition();
    private Condition notEmpty = lock.newCondition();
    private LinkedList<String> data = new LinkedList<>();
    private int capacity;
    public BlockingQueue(int capacity) {
        this.capacity = capacity;
    }
    public void push(String value) {
        lock.lock();
        try {
            while(data.size()==capacity) {
                try {
                    System.out.println("队列已满，请等待");
                    notFull.await();
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            data.addLast(value);
            notEmpty.signal();
        }finally {
            lock.unlock();
        }
    }
    public String get() {
        lock.lock();
        String value=null;
        try {
            while(data.isEmpty()) {
                try {
                    System.out.println("队列为空，请等待");
                    notEmpty.await();
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            value = data.removeFirst();
            notFull.signal();
        }finally {
            lock.unlock();
        }
        return value;
    }
    public static void main(String[] args) {
        BlockingQueue queue = new BlockingQueue(1);
        for(int i = 0;i<5;i++) {
            new Thread() {
                public void run() {
                    System.out.println("取到值"+queue.get());
                    try {
                        TimeUnit.SECONDS.sleep(1);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }.start();
        }

        for(int i = 0;i<5;i++) {
            new Thread() {
                public void run() {
                    queue.push("shidebin");
                    try {
                        TimeUnit.SECONDS.sleep(1);
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                }
            }.start();
        }
    }
}

console输出：

队列为空，请等待
队列为空，请等待
取到值shidebin
队列为空，请等待
队列为空，请等待
取到值shidebin
队列已满，请等待
取到值shidebin
队列为空，请等待
队列已满，请等待
取到值shidebin
取到值shidebin