Question

I am trying to learn about thread and find some examples in the internet. This is a java class that output “hello, world” every 3 seconds. But I have a feeling that the part about creating a Runable object is redundant.

Instead of writing

Runnable r = new Runnable(){ public void run(){...some actions...}}; 

Can I put the method run() somewhere else for easy reading?

This is what I have:

public class TickTock extends Thread {
    public static void main (String[] arg){
        Runnable r = new Runnable(){
            public void run(){
                try{
                    while (true) {
                        Thread.sleep(3000);
                        System.out.println("Hello, world!");
                    }
                } catch (InterruptedException iex) {
                    System.err.println("Message printer interrupted");
                }
            }
        };
      Thread thr = new Thread(r);
      thr.start();
}

And this is what I want to accomplish

public static void main (String[] arg){ 
          Runnable r = new Runnable() //so no run() method here, 
                                  //but where should I put run()
          Thread thr = new Thread(r);
          thr.start();
    }

Answer 1

Can I put the method run() somewhere else for easy reading?

Yes you could create your own runnable like this

public class CustomRunnable implements Runnable{
// put run here
}

and then

Runnable r = new CustomRunnable () ;
Thread thr = new Thread(r);