overriding

Override a function call in C

由 别等时光非礼了梦想. 提交于 2019-11-26 03:19:15
问题 I want to override certain function calls to various APIs for the sake of logging the calls, but I also might want to manipulate data before it is sent to the actual function. For example, say I use a function called getObjectName thousands of times in my source code. I want to temporarily override this function sometimes because I want to change the behaviour of this function to see the different result. I create a new source file like this: #include <apiheader.h> const char *getObjectName

Overriding vs method hiding [duplicate]

由 北城余情 提交于 2019-11-26 03:18:38
问题 This question already has answers here : Difference between shadowing and overriding in C#? (5 answers) Closed 9 months ago . I am a bit confused about overriding vs. hiding a method in C#. Practical uses of each would also be appreciated, as well as an explanation for when one would use each. I am confused about overriding - why do we override? What I have learnt so far is that by overring we can provide desired implementation to a method of a derived class, without changing the signature.

&#39;Must Override a Superclass Method&#39; Errors after importing a project into Eclipse

由 走远了吗. 提交于 2019-11-26 03:16:24
问题 Anytime I have to re-import my projects into Eclipse (if I reinstalled Eclipse, or changed the location of the projects), almost all of my overridden methods are not formatted correctly, causing the error: The method must override a superclass method It may be noteworthy to mention this is with Android projects - for whatever reason, the method argument values are not always populated, so I have to manually populate them myself. For instance: list.setOnCreateContextMenuListener(new

In which order do CSS stylesheets override?

由 雨燕双飞 提交于 2019-11-26 02:30:06
问题 In an HTML header, I\'ve got this: <head> <title>Title</title> <link href=\"styles.css\" rel=\"stylesheet\" type=\"text/css\"/> <link href=\"master.css\" rel=\"stylesheet\" type=\"text/css\"/> styles.css is my page-specific sheet. master.css is a sheet I use on each of my projects to override browser defaults. Which of these stylesheets takes priority? Example: first sheet contains specific body { margin:10px; } And associated borders, but the second contains my resets of html, body:not(input

C++ virtual function return type

由 让人想犯罪 __ 提交于 2019-11-26 02:29:11
问题 Is it possible for an inherited class to implement a virtual function with a different return type (not using a template as return)? 回答1: In some cases, yes, it is legal for a derived class to override a virtual function using a different return type as long as the return type is covariant with the original return type. For example, consider the following: class Base { public: virtual ~Base() {} virtual Base* clone() const = 0; }; class Derived: public Base { public: virtual Derived* clone()

Can java call parent overridden method in other objects but not subtype?

由 旧城冷巷雨未停 提交于 2019-11-26 02:12:10
问题 here is working java code class Cup { public String sayColor() { return \"i have a color .\"; } } class TCup extends Cup{ public String sayColor(){ System.out.println(super.getClass().getName()); return super.sayColor()+\"color is tee green.\"; } } class MyTCup extends TCup { public String sayColor(){ System.out.println(super.getClass().getName()); return super.sayColor()+\"but brushed to red now!\"; } } class Test { public static void main(String[] args) { Cup c = new MyTCup(); System.out

Override home and back button is case a boolean is true

由 一个人想着一个人 提交于 2019-11-26 01:59:01
问题 I was wondering if I can override the action of the back and home button is some cases. Normally these buttons should just react like they always do, but in a case some setting is true I want to override the buttons and let them call my own methods. I´m using these two methods to override these buttons: @Override public void onBackPressed() { // call my backbutton pressed method when boolean==true } @Override public void onAttachedToWindow() { this.getWindow().setType(WindowManager

What is the difference between dynamic and static polymorphism in Java?

由 给你一囗甜甜゛ 提交于 2019-11-26 01:50:44
问题 Can anyone provide a simple example that explains the difference between Dynamic and Static polymorphism in Java? 回答1: Polymorphism 1. Static binding/Compile-Time binding/Early binding/Method overloading.(in same class) 2. Dynamic binding/Run-Time binding/Late binding/Method overriding.(in different classes) overloading example: class Calculation { void sum(int a,int b){System.out.println(a+b);} void sum(int a,int b,int c){System.out.println(a+b+c);} public static void main(String args[]) {

What is the difference between method overloading and overriding? [duplicate]

由 末鹿安然 提交于 2019-11-26 01:36:02
问题 This question already has an answer here: Java overloading and overriding 9 answers Java overloading and overriding 9 answers What is the difference between overloading a method and overriding a method? Can anyone explain it with an example? 回答1: Method overloading deals with the notion of having two or more methods in the same class with the same name but different arguments. void foo(int a) void foo(int a, float b) Method overriding means having two methods with the same arguments, but

Difference between new and override

由 别等时光非礼了梦想. 提交于 2019-11-26 01:22:59
问题 Wondering what the difference is between the following: Case 1: Base Class public void DoIt(); Case 1: Inherited class public new void DoIt(); Case 2: Base Class public virtual void DoIt(); Case 2: Inherited class public override void DoIt(); Both case 1 and 2 appear to have the same effect based on the tests I have run. Is there a difference, or a preferred way? 回答1: The override modifier may be used on virtual methods and must be used on abstract methods. This indicates for the compiler to
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