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javaclassabstract
Joseph Saliba
Joseph Saliba

Reputation: 57

Question about Abstract Classes when classes are nested

So let's say ClassB is a class defined inside ClassA (Nested Classes), my question is, if ClassB is declared abstract as it contains abstract Methods, would ClassA also have to be declared Abstract ?

Upvotes: 1

Views: 197

Answers (2)

Nikolas
Nikolas

Reputation: 44398

Nope, it doesn't. It doesn't matter whether the outer or parent class is abstract, there is no rule in Java enforcing a class being abstract.

An example:

class classA {
    abstract class classB {      // can also be static
        abstract void foo();
    }
}

On the other hand, it's a bit different with the methods: abstract methods must be placed only inside the abstract classes or interfaces (implicitely abstract).

Upvotes: 1

John Bollinger
John Bollinger

Reputation: 180286

No. The methods of each class are its own. A class does not own the methods of other classes (or interfaces!) nested within, and containing a nested abstract class or a nested interface does not require the container class to be abstract.

Upvotes: 1

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