package chapter21;

public class LiftOff implements Runnable{
	int countDown=10;
	int taskCount=0; 
	final int id=taskCount++;
	
	public LiftOff(){
		
	}
	/*
	 * 這個構造方法必須要。
	 */
	
	public LiftOff(int countDown){
		this.countDown=countDown;
	}
	
	public String status(){
		return "#"+id+"("  +(countDown>0?countDown:"LiftOff!")+")	";
	}
	public void run(){
		while(countDown-->0){
			System.out.print(status());
			Thread.yield();
		}
	}
}