How to properly add a value change listener to Map.Entry?

A project im working on currently requires me to ensure that while looping through a map’s entries, if Entry.setValue is called, it would trigger a value change event. I see I can try something like …

Java override non abstract method as abstract in extended class

So I have a non-abstract method onStop inside the base class. Is it acceptable to make it abstract in the extented MyTask? The aim is to force the onStop to be implemented by classes that extend the …

Java: Calling a super method which calls an overridden method

public class SuperClass { public void method1() { System.out.println(“superclass method1”); this.method2(); } public void method2() { System.out.println(“…

Calling super super class method

Let’s say I have three classes A, B and C. B extends A C extends B All have a public void foo() method defined. Now from C’s foo() method I want to invoke A’s foo() method (NOT its parent B’s …