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Is it possible to declare a class as static in Java?

Anonymous User 1842 21 Jul 2015

Why are you not able to declare a class as static in Java?

Anonymous User

Other

I am a content writter !

1 Answers

Anonymous User 21 Jul 2015

Only nested classes can be static. By doing so you can use the nested class without having an instance of the outer class.

class OuterClass{
    public static class StaticNestedClass{
    }
    public class InnerClass{
    }
    public InnerClass getAnInnerClass(){
        return new InnerClass();
    }
    //This method doesn't work
    public static InnerClass getAnInnerClassStatically(){
        return new InnerClass();
    }
}

class OtherClass{
    //Use of a static nested class:
    private OuterClass.StaticNestedClass staticNestedClass = new OuterClass.StaticNestedClass();
    //Doesn't work
    private OuterClass.InnerClass innerClass = new OuterClass.InnerClass();
    //Use of an inner class:
    private OuterClass outerclass= new OuterClass();
    private OuterClass.InnerClass innerClass2 = outerclass.getAnInnerClass();
    private OuterClass.InnerClass innerClass3 = outerclass.new InnerClass();
}

Class with private constructor is static.

Declare your class like this:

public class eOAuth {
    private eOAuth(){}
    public final static int    ECodeOauthInvalidGrant = 0x1;
    public final static int    ECodeOauthUnknown       = 0x10;
    public static GetSomeStuff(){}
}

and you can used without initialization:

if (value == eOAuth.ECodeOauthInvalidGrant)
    eOAuth.GetSomeStuff();
...

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