java多线程总结三：sleep()、join()、interrupt()示例

这是一个来自《java编程思想上的示例》

package demo.thread;

/**
 *sleep()是静态方法，是属于类的，作用是让当前线程阻塞 
 *join()是使线程同步，如在某个线程里调用t.join()表示t线程执行完再执行当前线程
 *interrupt()给线程设定一个标志表示该线程已被中断，但在异常捕获时将清理这个标志
 *所以在catch子句中，该标志为false 
 */
public class SleepJoinDemo {
	public static void main(String[] args) {
		Sleeper sleep1 = new Sleeper("sleep1", 1500);
		Sleeper sleep2 = new Sleeper("sleep2", 1500);
		Joiner join1 = new Joiner("join1", sleep1);
		Joiner join2 = new Joiner("join2", sleep1);
		sleep2.interrupt();
	}
}

class Sleeper extends Thread {
	// 可以传参设定睡眠时间
	private int sleepTime;

	public Sleeper(String name, int sleepTime) {
		super(name);
		this.sleepTime = sleepTime;
		start();// 在构造方法中启动
	}

	@Override
	public void run() {
		try {
			sleep(sleepTime);
		} catch (InterruptedException e) {
			System.out.println(getName() + " was interrupted.\n"
					+ "isInterrupted():" + isInterrupted());
			return;
		}
		System.out.println(getName() + " has awakened");
	}
}

class Joiner extends Thread {
	private Sleeper sleeper;

	public Joiner(String name, Sleeper sleeper) {
		super(name);
		this.sleeper = sleeper;
		start();
	}

	public void run() {
		try {
			sleeper.join();//合并，异步变同步
		} catch (InterruptedException e) {
			System.out.println("interrupted");
		}
		System.out.println(getName() + " join completed");
	}
}