Static methods can not be overridden in the exact sense of the word, but they can hide parent static methods In practice it means that the compiler will decide which method to execute at the compile time, and not at the runtime, as it does with overridden instance methods. For a neat example have a … Read more
On invoking overridable method from constructors Simply put, this is wrong because it unnecessarily opens up possibilities to MANY bugs. When the @Override is invoked, the state of the object may be inconsistent and/or incomplete. A quote from Effective Java 2nd Edition, Item 17: Design and document for inheritance, or else prohibit it: There are … Read more
Yes. Only override it in that one Activity with don’t put this code in any other Activity
How to reproduce that error as simply as possible: Java code: Shows this compile time error: Why won’t it compile? Because: You created a class Cat which implements an interface Animal. Your interface called Animal has an abstract method called roar which must be overridden. You didn’t provide for method roar. There are many ways … Read more
The clearest way to express polymorphism is via an abstract base class (or interface) This class is abstract because the goPee() method is not definable for Humans. It is only definable for the subclasses Male and Female. Also, Human is an abstract concept — You cannot create a human that is neither Male nor Female. It’s got … Read more
There are different ways in which properties can be overridden. Assuming you have e.g. any of the following would override it: The first two “win” by selector specificity; the third one wins by !important, a blunt instrument. You could also organize your style sheets so that e.g. the rule wins simply by order, i.e. by being after an … Read more
Output: run: — Subash Adhikari – VS – K false — Subash Adhikari – VS – StackOverflow false — Subash Adhikari – VS – Subash Adhikari true — K – VS – StackOverflow false — K – VS – Subash Adhikari false — StackOverflow – VS – Subash Adhikari false — BUILD SUCCESSFUL (total time: … Read more
The override keyword serves two purposes: It shows the reader of the code that “this is a virtual method, that is overriding a virtual method of the base class.” The compiler also knows that it’s an override, so it can “check” that you are not altering/adding new methods that you think are overrides. To explain … Read more