How to add listener on ArrayList in java

Question

I want to create my own implementation of ArrayList in java, that can listen when the list is changing and to do action when this happens. From what I have read, I understan

Answer 1

the resp. ;)

private class MyList extends ArrayList {

      @Override
      public void sort(Comparator c) {
        super.sort(c); 
        resetLancamentos(); // call some metod ;)
      }
    //...
     @Override
     public boolean removeAll(Collection c) {
        //To change body of generated methods, choose Tools | Templates.
        boolean ret = super.removeAll(c);
        resetLancamentos(); // some metod like fireObjChanged() will do the job too
         return ret;
     }

}