overriding

I wonder why this is a valid override: public abstract class A { public abstract <X> Supplier<X> getSupplier(); public static class B extends A { @Override public Supplier<String> getSupplier() { return String::new; } } } Whereas this is not: public abstract class A { public abstract <X> Supplier<X> getSuppliers(Collection<String> strings); public static class B extends A { @Override public Supplier<String> getSuppliers(Collection<String> strings) { return String::new; } } } According to JLS §8.4.8.1 , B.getSupplier must be a subsignature A.getSupplier : An instance method mC declared in or

I've been going through the Ember documentation and am seeing an inconsistency in where the _super method is being called when overriding init . This is the most common and is what I've been using so far var Foo = Em.Object.extend({ init: function(){ this._super(); // ... my stuff ... } }); last night I was reading through this write up and saw an example doing this var Bar = Em.Object.extend({ init: function(){ // ... my stuff ... return this._super(); } }); It was actually an Ember.ContainerView in the code snippet. Can anyone explain this? My code OCD is acting up and I can't move on until

C++11 added override to ensure that member functions you write that you intend to override base-class virtual functions actually do (or won't compile). But in a large object hierarchy, sometimes you could accidentally end up writing a member function that overrides a base-class virtual when you didn't intend it! For instance: struct A { virtual void foo() { } // because obviously every class has foo(). }; struct B : A { ... }; class C : B { private: void foo() { // was intended to be a private function local to C // not intended to override A::foo(), but now does } }; Is there some compiler

I am new to eclipse plug-in development. I want to customize the renaming of a project. I need to validate the new name. So how can I override eclipse's rename/refactoring method? I saw something related to RenameParticipant, but didn't understand clearly. It would be great if someone could explain me steps to override the renaming functionality. Many Thanks, Ann The rename refactoring has several processors that subclass org.eclipse.ltk.core.refactoring.participants.RenameProcessor and are responsible for renaming different elements. For example, there is a processor for renaming Java

I have an abstract class : abstract class Foo(...){ def bar1(f : Foo) : Boolean def bar2(f : Foo) : Foo } multiple classes extend Foo and override the methods class FooImpl(...) extends Foo{ override def bar1(f : Foo) : Boolean { ... } override def bar2(f : Foo) : Foo { ... } } Is it possible, using generics (or something) to make the overriding methods have the parametertype of the subclass implementing it? Like this : class FooImpl(...) extends Foo{ override def bar1(f : FooImpl) : Boolean { ... } override def bar2(f : FooImpl) : FooImpl { ... } } I was thinking something along the line of

I have rewritten and stand-alone tested the behaviour of an inner function invoked by one of the Emacs functions bundled with Emacs 24. What is the preferred way of incorporating - e.g. in my init.el - my function's behaviour overriding the bundled function? I have followed various threads of advice vs fset etc. and am confused. @iainH You tend to get to a useful answer faster by describing what goal you're trying to accomplish, then what you have so far. I asked for code to try to help you do what you want to do without having to overwrite anything. I still don't understand why you don't just

What is the difference between the override and reintroduce directives? And when should I not use the inherited keyword in overridden methods? The reference to Jim's answer, which was excellent BTW, only described the when and where to use the directives. Another part of the answer is why are they needed anyway? Many languages get along just fine without them, right? When designing aspects of the Delphi Object Pascal Language, OOP (Object Oriented Programming) had been in the mainstream for several years. During this time it was observed that using many of the languages that had adopted those