public class  ThreadDemo_3
{
    public static void main(String[] args)
    {
        TestThread a1 = new TestThread();
        
        Thread a = new Thread(a1);
        a.start();
        while(true)
        {
            System.out.println("main thread is  running");
        }
        
    }
}
class TestThread implements Runnable
{
    public void run()
    {
        while (true)
        {
            System.out.println(Thread.currentThread().getName()+"is running~~");    
        }
    }
}