How to get overridden content information of child class in the abstract parent class

Question

How to get information about child classes overridden methods information in the abstract parent class. Example:

abstract Class A()
{
  protected void a1()
  {
    //some default content
  }
  protected void a2()
  {
    //some default content 
  }
}

 class B extends A
 {
    @Override
     public void a1()
      {
         //overridden content
      }
 } 
Class C extends A
{
   @Override
   public void a2()
   {
     //overriden content
   }
}

How get the information that Class c is overriding only a2 and Class B is overriding a1

I don't understand your question. Do you mean how to check if the method has been overridden? — user3437460, Oct 11 '17 at 03:27
Some extra concrete details would help understand the problem you're having. In general, in a good design `A` should *always* assume that its subclasses have valid implementations of all of its methods. That's the point of the contract! If `a1` is only applicable to some of `A`'s subclasses, it's likely that the logic using `a1` should be pushed to the subclass that needs it. — Mark Peters, Oct 11 '17 at 03:27

score 1 · Accepted Answer · answered Oct 11 '17 at 03:37

You can do following to play around (through refelction):

java.lang.Class class = B.class; // or any other child class
Class dec = class.getMethod("YourMEthodNAme").getDeclaringClass();
System.out.println(" Declaring class: " + dec.toString());

// you can check the anme of returned class, if it's A for a given method, then method is not overridden, if it's child class name , it's overriden

EDIT:

You can also do this in a loop:

      Method[] m = class.getMethods();
      for(int i = 0; i < m.length; i++) {

         // returns te declaring class
         Class dec = m[i].getDeclaringClass();

         // displays all methods
         System.out.println("Method = " + m[i].toString());
         System.out.println(" Declaring class: " + dec.toString());
      }

How to get overridden content information of child class in the abstract parent class

1 Answers1