JAVA编程思想第四版-多线程的练习答案之练习6

package exercise.exercise06;

import java.util.Random;

public class RandomSleepTask implements Runnable {

	@Override
	public void run() {
		int randomNum = new Random().nextInt(10);
		try {
			synchronized (this) {
				Thread.sleep(randomNum);
				System.out.println("sleep " + randomNum + " second");
			}
		} catch (InterruptedException e) {
			e.printStackTrace();
		} finally {
			System.out.println("RandomSleepTask exit...");
		}
	}

}

package exercise.exercise06;

public class MainThread {
	public static void main(String[] args){
		for (int i = 0; i < 10; i++) {
			new Thread(new RandomSleepTask()).start();
		}
	}
}