What's the harm in using Anonymous class?

Question

The question arose while reading a answer to this question - How do I join two lists in java. This answer gave the solution

List newList = new Arra         


        

Answer 1

Because you don't need a separate subclass - you just need to create a new ArrayList of the normal class, and addAll() both lists into it.

Like so:

public static List addLists (List a, List b) {
    List results = new ArrayList();
    results.addAll( a);
    results.addAll( b); 
    return results;
}

It's evil to create a subclass, that isn't needed. You don't need to extend or subclass behaviour - just change data values.