overriding

Detect if a method was overridden using Reflection (C#)

由 拥有回忆 提交于 2019-11-26 08:52:52
问题 Say I have a base class TestBase where I define a virtual method TestMe() class TestBase { public virtual bool TestMe() { } } Now I inherit this class: class Test1 : TestBase { public override bool TestMe() {} } Now, using Reflection, I need to find if the method TestMe has been overriden in child class - is it possible? What I need it for - I am writing a designer visualizer for type \"object\" to show the whole hierarchy of inheritance and also show which virtual methods were overridden at

Overriding vs Hiding Java - Confused

由 别来无恙 提交于 2019-11-26 08:50:53
问题 I\'m confused on how Overriding differs from Hiding in Java. Can anyone provide more details on how these differ? I read the Java Tutorial but the sample code still left me confused. To be more clear, I understand Overriding well. My issue is that I don\'t see that hiding is any different except for the fact that one is at the instance level while the other is at the class level. Looking at the Java tutorial code: public class Animal { public static void testClassMethod() { System.out.println

Override the {…} notation so i get an OrderedDict() instead of a dict()?

由 旧城冷巷雨未停 提交于 2019-11-26 08:49:22
问题 I want to use a .py file like a config file. So using the {...} notation I can create a dictionary using strings as keys but the definition order is lost in a standard python dictionary. My question: is it possible to override the {...} notation so that I get an OrderedDict() instead of a dict() ? I was hoping that simply overriding dict constructor with OrderedDict ( dict = OrderedDict ) would work, but it doesn\'t. Eg: dict = OrderedDict dictname = { \'B key\': \'value1\', \'A key\': \

What is the right way to override a setter method in Ruby on Rails?

由 戏子无情 提交于 2019-11-26 08:43:14
问题 I am using Ruby on Rails 3.2.2 and I would like to know if the following is a \"proper\"/\"correct\"/\"sure\" way to override a setter method for a my class attribute. attr_accessible :attribute_name def attribute_name=(value) ... # Some custom operation. self[:attribute_name] = value end The above code seems to work as expected. However, I would like to know if, by using the above code, in future I will have problems or, at least, what problems \"should I expect\"/\"could happen\" with Ruby

Inheritance and method overloading

由 南笙酒味 提交于 2019-11-26 08:24:48
问题 Why C++ compiler gives this error? Why i can access lol() from B, but can not access rofl() [without parameters]. Where is the catch? class A { public: void lol(void) {} void rofl(void) { return rofl(0);} virtual void rofl(int x) {} }; class B : public A { public: virtual void rofl(int x) {} }; int _tmain(int argc, _TCHAR* argv[]) { A a; a.lol(); a.rofl(1); a.rofl(); B b; b.lol(); b.rofl(1); b.rofl(); //ERROR -> B::rofl function does not take 0 arguments return 0; } 回答1: The B::rofl(int)

Override function (e.g. “alert”) and call the original function?

由 安稳与你 提交于 2019-11-26 08:22:53
问题 I would like to override a Javascript built-in function with a new version that calls the original (similarly to overriding a method on a class with a version that calls super in many languages). How can I do this? For example... window.alert = function(str) { //do something additional if(console) console.log(str); //super.alert(str) // How do I do this bit? } 回答1: Store a reference to the original function in a variable: (function() { var _alert = window.alert; // <-- Reference window.alert

Why do we have to override the equals() method in Java?

由 让人想犯罪 __ 提交于 2019-11-26 08:16:49
问题 I have some confusion about the reason that we override the .equals method. For example: Test test1 = new Test(3); Test test2 = new Test(3); //The if comparison does the same thing that the overridden `.equals()` method does. if(test1.equals(test2)){ System.out.println(\"test1 and test2 are true in .equals()\"); } // Override .equals method. public boolean equals(Object object) { if(object instanceof Test && ((Test)object).getValue() == this.t) { return true; } else { return false; } } I do

Type erasure, overriding and generics

由 余生长醉 提交于 2019-11-26 08:08:34
问题 Can someone explain to me why @Override public void fooMethod(Class<?> c) doesn\'t override public void fooMethod(Class c) and gives me the following errors instead: - Name clash: The method fooMethod(Class<?>) of type SubClass has the same erasure as fooMethod(Class) of type SuperClass but does not override it - The method fooMethod(Class<?>) of type SubClass must override a superclass method ? Edit: \" java -version \" says Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_16

Override home and back button is case a boolean is true

由 别说谁变了你拦得住时间么 提交于 2019-11-26 08:01:40
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.LayoutParams.TYPE_KEYGUARD); super.onAttachedToWindow(); // call my homebutton pressed method when boolean==true

Why / when would it be appropriate to override ToString?

由 安稳与你 提交于 2019-11-26 07:58:47
问题 I\'m studying C# and I wonder what the point and benefit of overriding ToString might be, as shown in the example below. Could this be done in some simpler way, using a common method without the override? public string GetToStringItemsHeadings { get { return string.Format(\"{0,-20} {1, -20}\", \"Office Email\", \"Private Email\"); } } public override string ToString() { string strOut = string.Format(\"{0,-20} {1, -20}\", m_work, m_personal); return strOut; } 回答1: Do you need to override
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