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What does static in front of nested interface mean?


What does static in front of nested interface mean?

By : user2185700
Date : November 22 2020, 04:01 AM
wish help you to fix your issue Both declarations are the same. The static modifier is redundant in this case.
code :


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Why would a static nested interface be used in Java?

Why would a static nested interface be used in Java?


By : Jeff
Date : March 29 2020, 07:55 AM
it helps some times The static keyword in the above example is redundant (a nested interface is automatically "static") and can be removed with no effect on semantics; I would recommend it be removed. The same goes for "public" on interface methods and "public final" on interface fields - the modifiers are redundant and just add clutter to the source code.
Either way, the developer is simply declaring an interface named Foo.Bar. There is no further association with the enclosing class, except that code which cannot access Foo will not be able to access Foo.Bar either. (From source code - bytecode or reflection can access Foo.Bar even if Foo is package-private!)
code :
public class Foo {
    public interface Bar {
        void callback();
    }
    public static void registerCallback(Bar bar) {...}
}
// ...elsewhere...
Foo.registerCallback(new Foo.Bar() {
    public void callback() {...}
});
How to define nested static classes with static methods, inherited from a nested interface in Java?

How to define nested static classes with static methods, inherited from a nested interface in Java?


By : Beau White
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , A static method declaration must always be followed by a definition. It cannot be implemented by subclasses.
I think you're just not approaching your problem right. Try a different approach!
code :
public static final NestedInterface firstNested = new NestedInterface() {
    @Override
    public void method() {
        // ...
    }
};
public enum NestedEnum  {

    FIRST {
        @Override
        public void method() {
            // ...
        }
    };

    public abstract void method();
}
Can you access a private [static] nested class through a public nested interface?

Can you access a private [static] nested class through a public nested interface?


By : ZadZion
Date : March 29 2020, 07:55 AM
will be helpful for those in need The short answer is "no." You'll need to make an instance of your implementation class and put it in a static variable. It'll look like this:
code :
public class EnclosingClass {
    public interface ClassFactory {
        public SomeClass getInstance(int which);
    }
    public static final ClassFactory CLASS_FACTORY;

    private static class ClassFactoryImpl implements ClassFactory {
        public SomeClass getInstance(int which) { /* ... */ }
    }

    static {
        CLASS_FACTORY = new ClassFactoryImpl();
    }
}
SomeClass x = EnclosingClass.CLASS_FACTORY.getInstance(2);
Can an interface nested inside a class be non-static?

Can an interface nested inside a class be non-static?


By : Maël
Date : March 29 2020, 07:55 AM
I wish this help you a non-static inner class is just syntax sugar. A non-static inner class is exactly the same as a standard 'outer' class, with one exception: It has an invisible field of the type of your outer class which is declared final. ALL constructors of your inner class have as first parameter the instance of the outer to which this field must be set.. and then there's a biiig sack of syntax sugar thrown all over this to also hide those.
But that's really how it works, and you can use javap to confirm it. So, given:
code :
public class Outer { public class Inner {} }
public class Outer {}
class Desugared {
    private final Outer outer;
    public Desugared(Outer outer) { this.outer = outer; }
}
Outer o = new Outer();
o.new Outer.Inner();
Outer o = new Outer();
new Desugared(o);
Interface Static Methods on Nested Class

Interface Static Methods on Nested Class


By : Leosh
Date : March 29 2020, 07:55 AM
I hope this helps . In java, You have to override all methods of an implemented Interface, and as static methods are part of classes not Objects and they are not overridable that's why static methods inside interfaces are not allowed (for before java8 ).
In Java8, static method in Interface is allowed but they must have body inside the interface and you can't override them inside the implementation classes.
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