Questions tagged [overriding]

Method overriding, in object oriented programming, is a language feature that allows a subclass or child class to provide a specific implementation of a method that is already provided by one of its superclasses or parent classes.

Method overriding, in object oriented programming, is a language feature that allows a subclass or child class to provide a specific implementation of a method that is already provided by one of its super classes or parent classes.

The implementation in the subclass overrides (replaces) the implementation in the superclass by providing a method that has same name, same parameters or signature, and same return type as the method in the parent class.

Don't confuse it with

Read on Wikipedia

Example in Java

class Thought {
    public void message() {
        System.out.println("I feel like I am diagonally parked in a parallel universe.");
    }
}

public class Advice extends Thought {
    @Override  // @Override annotation in Java 5 is optional but helpful.
    public void message() {
        System.out.println("Warning: Dates in calendar are closer than they appear.");
    }
}
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How to make sure a future inheritance overrides a procedure?

I'm writing a class with some virtual/abstract procedures which I expect to get overridden. However they might not be overridden as well, which is also fine. The problem is finding out whether one of these procedures was actually overridden or not.…
Jerry Dodge
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java override method invocation

I have a super class: public class SuperClass { public void dosomething() { firstMethod(); secondMethod(); } public void firstMethod() { System.out.println("Super first method"); } public void…
Felix
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Problems overriding paintEvent with PySide

I've subclassed the QPlainTextEdit class and have tried to override the paintEvent function so that I can draw a line number area onto it. def paintEvent(self, e): super(CodeEditor, self).paintEvent(e) qp = QtGui.QPainter() …
Lolecule
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Manually set JDK path in Eclipse

I'm trying to install Eclipse, Android SDK, JDK6 and JRE6 to one of the computers in my school. I have limited access to it so I can't run any installators or modify the program files folder. I have installed everything on my home computer and…
Finnboy11
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C++ override a member variable (std::vector)

here are the classes which my question is about class Graph {} class SceneGraph : public Graph {} class Node { public: virtual Node* getNode(int index) { return mNodeList[index]; } protected: vector mNodeList; Graph*…
Cihan
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Override a method inside a gem from another gem

Ok, I have a rails gem that I am working on and I want it to override a specific method in sprockets. The method I want to override is: Sprockets::Base.digest so that I can base the fingerprint off my gem version when compiling the app's assets. How…
ifightcrime
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Javascript implementation dilemna: looking for a class with method overriding solution

I am no expert with Javascript. I have developed an operational page, using a function to define a class (as described here) for some of my JS code. This class is quite complex and helps computing object positions. It is now tested and…
Jérôme Verstrynge
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Don't use type tests, declare doTheTask?

I'm going through Java For Everyone by Cay Horstmann. I'm a bit confused on when it says: Don't Use Type Tests This is about using instanceof operator for specific type tests in order to implement behavior that varies with each class like (taken…
orange
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Overriding setters with arc and dynamic properties

I need to do some additional stuff in a setter method. But I get an infinite loop when doing so: I've got a core data object @interface Transaction : NSManagedObject @property (nonatomic, retain) NSDate * date; @end @implementation…
toom
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Anonymous Inner Classes: When are they (in)appropriate?

Take the following example. There's an object I want to use, call it a Doodad. Doodad elements have poorly implemented handling of browser events. Typical instantiation of a Doodad would be Doodad someDoodad = new Doodad();. Obviously this isn't…
Chris Cashwell
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Override function in non derived c# class

I have the following class public class classB : classA which contains function dostuff Now I have a class SUPER, which has an instance of B amongst its variables classB SUPER_B; and that has a 'redefinition' of 'dostuff' amongst its…
roamcel
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Attempting to override dictionary ToString for ComboBox

I am attempting to store metadata in my ComboBox elements by overriding a Dictionary<>'s ToString(). However, my ToString() override does not appear to be executing, and I can't figure out why. The ComboBox displays "(Collection)" instead of the…
Brandon
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Can't execute code from a freed script

I have a function that in a different frame that I need to override. In addition, I need to call the original function from within my override. To do so, I'm using the following: myFrame.SomeFunction = (function () { var originalSomeFunction =…
RMD
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What are the reasons to override new and delete operator for a specific class?

The dynamic memory allocation operators - new and delete can be overridden for a specific class. I could define a different memory allocation scheme than the default that is provided by the C++ Run-time on windows. I have few questions related to…
Anand Patel
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Overriding method by return type in scala, oop solution?

I have some problem to find oop information about my problem in scala, peraphs you can help me to find a good solution, or good web/book ressources ? I have one principal abstract class Operator : abstract class Operator[G <: AbstractGenome, F <:…
reyman64
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