1 class ThreadDemo extends Thread{
 2     @Override
 3     public void run(){
 4         System.out.println("the thread is: "+Thread.currentThread().getName());
 5     }
 6     public static void main(String[] args){
 7         System.out.println("the thread is : "+Thread.currentThread().getName());
 8         ThreadDemo td1 = new ThreadDemo();
 9         td1.setName("Th-1");
10         td1.start();
11 
12         ThreadDemo td2 = new ThreadDemo();
13         td2.start();
14     }
15 }

 1 class ThreadImplementsRunnable implements Runnable{
 2     @Override
 3     public void run(){
 4         System.out.println("The thread is " + Thread.currentThread().getName()+" and the Thred id is " + Thread.currentThread().getId());    
 5     }
 6     public static void main(String[] args){
 7         System.out.println("This is "+Thread.currentThread().getName()+" thread "+"and the Thread id is "+Thread.currentThread().getId());
 8 
 9         ThreadImplementsRunnable tir1 = new ThreadImplementsRunnable();
10         Thread thread1 =  new Thread(tir1);
11         thread1.setName("SelfThread-1");
12         thread1.start();
13 
14     }
15 }