public class Thread_1 {
  public static void main(String[] args)   throws InterruptedException{
    EvenOdd odd = new EvenOdd(1, 20);  //created a thread
    EvenOdd even = new EvenOdd(0, 30);

    odd.start();
    even.start();
    odd.join();   //the main() thread waits for the child threads to finish.
    even.join();
    System.out.println("\nMain thread done");
  }
}

class EvenOdd extends Thread{
  private int i0, delay;
  public EvenOdd(int first, int interval){
    i0 = first;
    delay = interval;
  }
  public void run(){
    try{
      for(int i = i0; i < 30; i += 2){
        if(i%10 != 0){
          System.out.print(i + "\t");
          sleep(delay);
        }
        else{
        System.out.print(i + "\n");
         sleep(delay);
        }
      }}
    catch(InterruptedException e){
      return;
    }
    } //end of run()
  } //end of class EvenOdd{}