Thread runnable method

public class NewThread implements Runnable {
    String name;
    Thread t;
    NewThread(String threadname){
        name=threadname;
        t=new Thread(this,name);
        System.out.println("New Thread: "+t);
    }
    public void run(){
        try{
            for(int i=5;i>0;i--){
                System.out.println(name+": "+i);
                Thread.sleep(1000);
            }
        }catch(InterruptedException e){
            System.out.println(name+" exiting.");
        }
    }
}
class DemoJoin{
    public static void main(String[] args) {
        NewThread nt1=new NewThread("one");
        NewThread nt2=new NewThread("two");
        NewThread nt3=new NewThread("three");
        nt1.t.start();
        nt2.t.start();
        nt3.t.start();
        System.out.println("Thread one is Alive:"+nt1.t.isAlive());
        System.out.println("Thread two is Alive:"+nt2.t.isAlive());
        System.out.println("Thread three is Alive:"+nt3.t.isAlive());
        try{
            System.out.println("waiting for threads to finish.");
            nt1.t.join();
            nt2.t.join();
            nt3.t.join();
        }
        catch(InterruptedException e){
            System.out.println("Main thread Interrupted");
        }
        System.out.println("Thread one is Alive:"+nt1.t.isAlive());
        System.out.println("Thread two is Alive:"+nt2.t.isAlive());
        System.out.println("Thread three is Alive:"+nt3.t.isAlive());
        System.out.println("Main thread exiting");

    }
}