JAVA编程思想第四版-多线程的练习答案之练习20

package exercise.exercise20;

public class LiftOff implements Runnable {

	protected int countDown = 10;
	private static int taskCount = 0;

	private final int id = taskCount++;

	public LiftOff() {
	}

	public LiftOff(int countDown) {
		this.countDown = countDown;
	}

	public String status() {
		return "#" + id + "(" + (countDown > 0 ? countDown : "Liftoff") + ")";
	}

	@Override
	public void run() {
		try {
			while (countDown-- > 0) {
				System.out.println(status());
				Thread.sleep(100);
			}
		} catch (InterruptedException e) {
			System.out.println("#" + id + " is interrupted!");
		}
	}

}

package exercise.exercise20;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class CachedThreadPool {

	/**
	 * @param args
	 * @throws InterruptedException 
	 */
	public static void main(String[] args) throws InterruptedException {
		ExecutorService exec = Executors.newCachedThreadPool();
		for (int i = 0; i < 5; i++) {// 
			exec.execute(new LiftOff());
		}
		Thread.sleep(800);
		exec.shutdownNow();
	}

}