void xx()
{
xx();
}

public class RecThread implements Runnable
{
    Thread t;
    public RecThread(){
        t = new Thread(this);
        t.start();
    }
    public void run(){
        int i = 0;
        while(i < 10){
            if(i == 5)
run();
            else
            System.out.println("i:=["+i+"]");
            
            try{Thread.sleep(500);}
            catch(Exception ex){}
            i++;
        }
    }
    public static void main(String[]args){
        RecThread rt = new RecThread();
    }
}