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Possible Duplicate: Why can’t I declare static methods in an interface? Inside the interface body we aren't able to declare or define any static method. What is the reason? Can any one ...

NOTE: This question predates Java 8. As of Java 8, static methods are allowed in interfaces. However, they cannot be declared abstract (required to be overridden) in the manner requested by this ...

I understand that in Java static methods are inherited just like instance methods, with the difference that when they are redeclared, the parent implementations are hidden rather than overridden. Fine,...

I was going through Effective Java and reading static factory methods for creating objects. Its chapter 2, Item 1. There in the advantage no. 3, the writer has mentioned like Hiding implementation ...

Suppose I write a library with the following: public class Bar { /* ... */ } public class SomeWeirdClass<T> where T : ??? { public T BarMaker(Bar b) { // ... play with b ...

I'm confused why the following is not allowed: public interface MyInterface { MyInterface getInstance(String name); } public class MyImplementation implements MyInterface { public ...

I'm just curious, wouldn't it be more convinient to allow interfaces to contain implementations of static methods? Such methods could contain short commonly used(by this interface implementors) logic.

I'm interested in doing something like this: public interface Foo { public static "abstract" Bar SOME_BAR; // subclasses define one of these } and public interface Foo { public static "...

I have written this java code public interface Sorter { public static <T extends Comparable<T>> void sort(T[] array); } and the compiler throws this error at me: Sorter.java:7: ...

Consider the followoing code interface MyInterface{ void method(String s);// if we write static modifier we have compile error } class MyClass implements MyInterface{ public static void main(...

I have a design question. I have an interface that read XML. Each implementer class read different XML and I want a way to identify which implementer should I dynamically create for the xml type I ...

I have a protocol called Social Service, declared as follows: protocol SocialService: class { class func testFunc() } A class that follows the protocol may look like this: class Twitter: ...

I defined an interface IPersistent that has two methods load and save. Using these methods I can load or save the implementing class using whatever method they want. public interface IPersistent { ...

Say I have some class that is too fat of methods for one concrete case, but fits to about a half of them, so it is no way but to extend it. Simultaneously, I want to hide the fact that I've extended ...

I Have a UserEntity class which implements the IUserEntity interface. In the UserEntity class I have a static map: private static Map<IUserEntity.IIdentifiable, IUserEntity> ...