Thread creation and starting

This question already has an answer here:

“implements Runnable” vs. “extends Thread” 40 answers

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In general you should not extend Thread , but implement Runnable instead. Your example would then become:

class MyRunnable implements Runnable {

   public void run() {
      // Whatever needs to be done.
   }
}

MyRunnable obj = new MyRunnable();
Thread t = new Thread(obj);
t.start()

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Yes, there is a difference: you should not extend Thread , but use new Thread(myRunnable) . This is similar to your first approach, only your way is misguided in extending Thread instead of implementing Runnable. So do this:

class MyRunnable implements Runnable {
   public void run() { ... }
}

Thread t = new MyThread(new MyRunnable());
t.start();

or, more conveniently,

new Thread(new Runnable() { public void run() {
  ... stuff ...
}}).start();

Be sure to distinguish the concepts of Thread and Runnable : the former is a heavy-weight handle to an actual system resource; the latter is just a holder of a method.

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Thread t = new Thread(obj); takes a Runnable obj - the recommended way.

MyThread obj = new MyThread(); requires you to extend Thread which is considered inadvisable nowadays.

See "implements Runnable" vs. "extends Thread" for details on the debate.

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