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/have to override
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.deviceService(); It is using ‘context’ to call the method deviceService().
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 parameter declared in class. That causes the error, most probably you don’t need
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 number of arguments passed to the method in
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 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 like this should be achievable. I have tried looking
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 it’s purpose and what happens when I override it and furthermore, why
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 …