Can a class be declared inside a interface?

[Abimaran Kugathasan]

I got this question from here

abstract interface Bendable	{
	final int x = 2009;

	void method();

	public static class Angle	{}
}

What is the usage of this kind of declaration?

[Lokesh Duseja]

Yes you can!!

You can even implement this interface and make an object of this "inner static" class... see the code below

    
abstract interface Bendable	{
	final int x = 2009;
	void method();
	public static class Angle	{}
}

class MyClass implements Bendable
{
	public void method()
	{
	}
	public static void main(String args[])
	{
		MyClass my = new MyClass();

		/*****The incorrect way *****
		MyClass.Angle ang = my.new Angle();//----Wont work because Angle is implicitly static
		********/
		
		MyClass.Angle ang = new MyClass.Angle();//-- CORRECT
	}
}

My friend.... you were too kind to declare that inner class "public static" and the interface as "abstract"... these are implicit!!

I think my explanation is correct..... if not, blame it to the beer..... normally i don't "drink and drive"!!

[Abimaran Kugathasan]

Thanks a lot...BTW, Can we 'override' that class declaration in our implementation class?

[Lalit Mehra]

no you can't because ... it is implicitly final and static

[Lokesh Duseja]

i did not get the last question..... overriding a class? i only heard of overriding method....

[Abimaran Kugathasan]

Lalit Mehra wrote:no you can't because ... it is implicitly final and static

OMG! I forgot it thanks.....

[Ankit Garg]

Lokesh Duseja wrote: i did not get the last question..... overriding a class? i only heard of overriding method....

+1, there is nothing like overriding a class

interface MyInterface {
	class InnerInterface{}
}
class InterfaceInnerClass implements MyInterface {
	class InnerInterface {}  //fine
}

Classes declared inside of interfaces are not final

interface MyInterface {
	class InnerInterface{}
}
class InterfaceInnerClass implements MyInterface {
	class InnerInterface2 extends InnerInterface {}  //fine
}

[Deepak Bala]

Ankit Garg wrote:

Lokesh Duseja wrote: i did not get the last question..... overriding a class? i only heard of overriding method....

+1, there is nothing like overriding a class

interface MyInterface {
	class InnerInterface{}
}
class InterfaceInnerClass implements MyInterface {
	class InnerInterface {}  //fine
}

Classes declared inside of interfaces are not final

interface MyInterface {
	class InnerInterface{}
}
class InterfaceInnerClass implements MyInterface {
	class InnerInterface2 extends InnerInterface {}  //fine
}

I hope no one ever does that in production

[Ankit Garg]

Deepak Bala wrote:I hope no one ever does that in production

Why not, the programmer can win an Obfuscated Code Contest with it