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public abstract interface Frobnicate { public void twiddle(String s); } Which is a correct class?

public abstract class Frob implements Frobnicate { public abstract void twiddle(String s) { } }
public abstract class Frob implements Frobnicate { }
public class Frob extends Frobnicate { public void twiddle(Integer i) { } }
public class Frob implements Frobnicate { public void twiddle(Integer i) { } }

Correct Answer: public abstract class Frob implements Frobnicate { }

Explanation:

B is correct, an abstract class need not implement any or all of an interface’s methods

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