java 6 Thread interrupt

I have got this piece of code:

  public class ThreadInteraction {
 public static void main(String[] argv) {
     System.out.println("Create and start a thread t1, then going to sleep...");
     Thread1 t1 = new Thread1();
     t1.start();
 
 
     try{
         Thread.sleep(1000);
     }
     catch(InterruptedException e) {
         System.out.println(e.toString());
     }
 
             //let's interrupt t1
             System.out.println("----------- Interrupt t1");
     t1.interrupt();
 
     for(int i =0; i<100; i++)
         System.out.println("Main is back");
  }
 }
 
 class Thread1 extends Thread {
   public void run() {
      for(int i =0; i<10000; i++)
           System.out.println(i + "thread1");
   }
  }
 

It seems like t1.interrupt() doesn't work as in my output all 10000 t1 print appears. Am I doing somethign wrong?

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