title: run method in Thread class
body: <p>The output is : RunnableA ThreadB<br>
  I don't understand how it comes?? (what happens in the run method in class B)</p>
  
  <pre><code>class A implements Runnable{
      public void run(){
          System.out.println("RunnableA");
      }
  }
  class B extends Thread{
      B(Runnable r){
          super(r);
      }
      public void run(){
          super.run();
          System.out.println("ThreadB");
      }
  }
  class Demo{
      public static void main (String []args){
          A a=new A();
          Thread t=new B(a);
          t.run();
      }
  }
  </code></pre>