I have a player class which extends a JLabel and I wanna override an Update method from a parent class to implement physics for the player but I have to extend the parent class which I cant do cause I already extended the JLabel, any help will be appreciated. Answer The short answer is probably no. You can/ha…
Tag: overriding
Calling an abstract method from an interface without overriding it
I am working on a Java project and want to understand the source code before implementing mine into it. The problem im facing is, how can the source code uses the abstract method from an interface without actually overriding it? At first, I came to this statement: DeviceService deviceService = context.deviceS…
Unable to override generic method in java
I am getting errors like Main.java:12: error: TextMessage is not abstract and does not override abstract method setContent(T) in Message class TextMessage extends Message { ^ where T is a type-variable: T extends Object declared in method setContent(T) 1 error Answer Your method declaration: hides the type pa…
Define Methods in Interface Without Specifying Number of Parameters
I’m trying to implement classes from the same interface but with a different number of parameters in method like the code below. Is there a way in Java to define methods in the interface without constraining the number of parameters? Answer You could use the ellipsis syntax (…) and then check the …
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 adding a listener into an extension of the Map class on the .put method. My question is, would entries be…
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 create method in Interface and change the parameter type
How do I create an interface that when Overridden can have different types? Sometimes I would like the method to accept an item of type ‘HtmlPage’ and other times I would like it to take the type ‘Document’. Later these could change to even more types. Example: I am thinking something …
What is addNotify();?
I’ve tried to find a laymans definition of addNotify() but I can’t really get any answer using Google. As far as I know, when overriding addNotify() in my class, I should call super.addNotify(); and then do whatever else afterward. My question is, does addNotify() run automatically? What is itR…
Hibernate : How override an attribute from mapped super class
The generic entity, super class: The pojo: I try to use thoses annotations : @AttributeOverride, @Id, … but It doesn’t work. Can you help me? I want to override the attribute “id” to specify another column name and a sequence by pojo/table. What is the best way to do that? Answer Try t…
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(“…