A question about the Thread class

Question

the code below are two way of invoke a thread to run:
A:
public class Test {
public static void main(String args[]) {
     Thread myThread = new Thread(){
          public void run(){
               System.out.println("in myThread! \n");
               System.out.println(Thread.currentThread());
     Thread th = new Thread(myThread,"new Thread");
     th.start();
B:
public class Test {
public static void main(String args[]) {
     Thread myThread = new Thread(){
          public void run(){
               System.out.println("in myThread! \n");
               System.out.println(Thread.currentThread());
     myThread.start();
i have read many free software's source code, and find many people would like to implement it like A instead of B
so my question is why A is better than B.
thanks!!

Answer 1

A is actually using the constructor which accepts a Runnable. In your case, since you are overriding only run(), you could have simply implemented the Runnable and created the thread th. However, in this model you are using a Runnable you are actually separating the task from the Thread. In B, thread is actually the task which couples them tightly. Therefore, from design point of view, A is recommended with Runnable rather than a Thread unless you have specific reasons to do that.