How to perform multiple tasks by multiple threads (multitasking in multithreading)?

If you have to perform multiple tasks by multiple threads,have multiple run() methods.For example: Program of performing two tasks by two threads

1. class Simple1 extends Thread{  
2.  public void run(){  
3.    System.out.println("task one");  
4.  }  
5. }  
6.   
7. class Simple2 extends Thread{  
8.  public void run(){  
9.    System.out.println("task two");  
10.  }  
11. }  
12.   
13.  class TestMultitasking3{  
14.  public static void main(String args[]){  
15.   Simple1 t1=new Simple1();  
16.   Simple2 t2=new Simple2();  
17.   
18.   t1.start();  
19.   t2.start();  
20.  }  
21. } 

Output:task one
       task two