java中的线程-1

import java.lang.Thread;
import java.util.concurrent.*;
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.print(status());
				Thread.yield();
				// TimeUnit.MILLISECONDS.sleep(1000);
				
			}
		// }catch(InterruptedException e){
			// System.out.println("It is interrupted!");
		// }
	}
}
public class ThreadDemo{
	// public static void main(String[] args){
		// System.out.println("START?");
		// for(int i=0;i<5;i++){
			// Thread t=new Thread(new LiftOff());
			// t.start();
		// }
		// System.out.println("END?");
		// for(int i=0;i<10;i++)
			// System.out.println(i);
	// }
	public static void main(String[] args){
		for(int i=0;i<3;i++)
			System.out.println("Before:"+i);
		
		ExecutorService exec=Executors.newSingleThreadExecutor();
		for(int i=0;i<5;i++){
			exec.execute(new LiftOff());
		}
		exec.shutdown();
		
		for(int i=0;i<10;i++)
			System.out.println("After:"+i);
	}
}