多线程控制执行-优快云博客

本文通过一个Java多线程示例展示了如何使用synchronized关键字来实现线程间的同步操作。三个子线程分别执行不同的任务并在完成后更新共享变量count，主线程则监控这个变量以确保所有子线程都已完成其任务。

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package org.masque.effective;

import java.util.concurrent.TimeUnit;
/**
 * 
 * @author masque.java@gmail.com
 *
 */
public class ThreadTest {
	
    static int count = 0;
	
	public static synchronized int getCount() {
		return count;
	}

	public static synchronized void setCount() {
		count++;
	}

	public static void main(String[] args) throws InterruptedException {
		(new Thread1()).start();
		(new Thread2()).start();
		(new Thread3()).start();
		while (true) {
			TimeUnit.SECONDS.sleep(1);
			if (getCount()==3) {
				System.out.println("over!");
				return;
			}
		}
	}
	
	
	
}

class Thread1 extends Thread{
	@Override
	public void run() {
		for (int i=10;i<200;i++) {
			System.out.println("Thread1===========:"+i);
			try {
				TimeUnit.SECONDS.sleep(1);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		ThreadTest.setCount();
	}
}

class Thread2 extends Thread{
	@Override
	public void run() {
		for (int i=10;i<200;i++) {
			System.out.println("Thread2===========:"+i);
			try {
				TimeUnit.SECONDS.sleep(1);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		ThreadTest.setCount();
	}
}

class Thread3 extends Thread{
	@Override
	public void run() {
		for (int i=10;i<200;i++) {
			System.out.println("Thread3===========:"+i);
			try {
				TimeUnit.SECONDS.sleep(1);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		ThreadTest.setCount();
	}
}