java笔记--关于线程通信

关于线程通信

使用多线程编程的一个重要原因就是线程间通信的代价比较小

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关键技术：

yield(): Thread类的一个静态方法，用来暂停当前正在执行的线程对象，并执行其他线程

public static void yield(){}

代码实例：

实现线程间的发送和接收消息

package com.xhj.thread;

/**
 * 线程之间的通信 Thread.yeild()暂停当前线程，执行其他线程
 *
 * @author XIEHEJUN
 *
 */
public class CommunicationThread {

    /**
     * 发送线程类
     *
     * @author XIEHEJUN
     *
     */
    private class SendThread implements Runnable {
        private String[] products = { "java宝典", "C#宝典", "C宝典", "C++宝典",
                "Pyhtion宝典" };
        private volatile String productName;
        private volatile boolean sendState;

        public String getProductName() {
            return productName;
        }

        public void setSendState(boolean sendState) {
            this.sendState = sendState;
        }

        public boolean isSendState() {
            return sendState;
        }

        @Override
        public void run() {
            for (int i = 0; i < 5; i++) {
                while (sendState) {
                    Thread.yield();
                }
                productName = products[i];
                System.out.println("发送:" + productName);
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                sendState = true;
            }
        }
    }

    /**
     * 接受线程类
     *
     * @author XIEHEJUN
     *
     */
    private class ReceiveThrend implements Runnable {
        private SendThread send;

        public ReceiveThrend(SendThread send) {
            this.send = send;
        }

        @Override
        public void run() {
            for (int i = 0; i < 5; i++) {
                while (!send.isSendState()) {
                    Thread.yield();
                }
                System.out.println("接收：" + send.getProductName());
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                send.setSendState(false);
            }

        }

    }

    /**
     * 调用线程
     */
    public void useThread() {
        SendThread send = new SendThread();
        ReceiveThrend receive = new ReceiveThrend(send);
        System.out.println("线程1");
        Thread thread1 = new Thread(send);
        thread1.start();
        System.out.println("线程2");
        Thread thread2 = new Thread(receive);
        thread2.start();
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        CommunicationThread communicationThread = new CommunicationThread();
        communicationThread.useThread();

    }
}

注：线程间的通信重点关注通信的内容，要确保其是同步的，而且各个线程对该资源使用后是要及时释放的，

否则将会出现死锁现象。而且在实际应用当中，商品的信息通常都是存储在数据库中的。