package ch9;

public class CountDown3{ static int idcnt=1;
    public static void main(String[] args){
        new SubThread().start();
        new Thread(new Run()).start();
    }
}
class SubThread extends Thread{
    private final int threadid=CountDown3.idcnt++;
    public void run(){
        try{ Thread.sleep(1000); System.out.println("#"+threadid);
        } catch (Exception e){ e.printStackTrace(); }	
    }
}
class Parent{ public void doSth(){ System.out.println("do something ..."); }
}
class Run extends Parent implements Runnable{
    private final int threadid=CountDown3.idcnt++;
    public void run(){
        try{ Thread.sleep(1000); System.out.print("#"+threadid+": "); doSth();
        } catch (Exception e){ e.printStackTrace(); }
    }
}