编写一个小程序，观察线程的执行

public class TestThread{
    
    public static void main(String[] args){
        
        MyRunner r = new MyRunner();
        Thread t = new Thread(r);
        t.start();
        
        for(int i=0;i<100;i++){
            System.out.println("Main:"+i);
        }
    }
    
}

class MyRunner implements Runnable{
    
    public void run(){
        for(int i=0;i<100;i++){
            System.out.println("MyRunner:"+i);
        }
    }
        
}