can a class implements an interface and an abstract class

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C#

C#4.0

can a class implements an interface and an abstract class

Posted 26-Feb-12 23:18pm

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Dylan Morley · Answer 1 · 2012-02-26T23:29:00

Solution 2

Yes...

C#

public class MyClass : SomeAbstractClass, ISomeInterface
{

    public override int AbstractMethodNeedsImplementation()
    {
        return 10;
    }

    #region ISomeInterface Implementation

    public void SomeMethod()
    {
    }
    
    #endregion

}

Posted 26-Feb-12 23:29pm

Dylan Morley

CRDave1988 · Answer 2 · 2012-02-26T23:27:00

Solution 1

YES U CAN Do THAT

Posted 26-Feb-12 23:27pm

CRDave1988

Varun Sareen · Answer 3 · 2012-02-26T23:37:00

Yes. Any concrete subclass will have to implement the abstract methods, so they will be implemented by the time any JVM is asked to invoke the method. It's just a special case of implementing by forcing subclasses to implement for you.

Your abstract class doesn't even have to mention the methods in the interface it 'implements', e.g. the following:-

interface SomeInterface {  
   void foo();  
   int  bar();  
}  
public abstract class YourClass implements SomeInterface {  
   // no mention of foo() and bar() here  
}

is perfectly legal. If a subclass of YourClass wants to be concrete class, it has to implement both foo() and bar().

I hope this clears your confusion.

Thanks