How to perform single task by multiple threads?

If you have to perform single task by many threads, have only one run() method.For example: Program of performing single task by multiple threads

1. class TestMultitasking1 extends Thread{  
2.  public void run(){  
3.    System.out.println("task one");  
4.  }  
5.  public static void main(String args[]){  
6.   TestMultitasking1 t1=new TestMultitasking1();  
7.   TestMultitasking1 t2=new TestMultitasking1();  
8.   TestMultitasking1 t3=new TestMultitasking1();  
9.   
10.   t1.start();  
11.   t2.start();  
12.   t3.start();  
13.  }  
14. }  

Output:task one
       task one
       task one

Program of performing single task by multiple threads

1. class TestMultitasking2 implements Runnable{  
2. public void run(){  
3. System.out.println("task one");  
4. }  
5.   
6. public static void main(String args[]){  
7. Thread t1 =new Thread(new TestMultitasking2());//passing annonymous object of TestMultitasking2 class  
8. Thread t2 =new Thread(new TestMultitasking2());  
9.   
10. t1.start();  
11. t2.start();  
12.   
13.  }  
14. }  

Output:task one
       task one

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Note: Each thread run in a separate callstack.