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The question is: How can we make sure that the threads executes in a particular order ?
The Answer is: By using join() method appropriately

public class JoinExample {
   public static void main(String[] args) {
      Thread th1 = new Thread(new MyClass(), "th1");
      Thread th2 = new Thread(new MyClass(), "th2");
      Thread th3 = new Thread(new MyClass(), "th3");
         
      // Start first thread immediately
      th1.start();
         
      /* Start second thread(th2) once first thread(th1) 
       * is dead
       */
      try {
          th1.join();
      } catch (InterruptedException ie) {
          ie.printStackTrace();
        }
      th2.start();
         
      /* Start third thread(th3) once second thread(th2) 
       * is dead
       */
      try {
          th2.join();
      } catch (InterruptedException ie) {
           ie.printStackTrace();
        }
      th3.start();
         
      // Displaying a message once third thread is dead
      try {
          th3.join();
      } catch (InterruptedException ie) {
            ie.printStackTrace();
        }  
      System.out.println("All three threads have finished execution");
   }
}