Java overloading rules

Question

I came across two overloading questions recently that I can\'t find an answer for and don\'t have a java environment to run some test code. I\'m hoping someone can help me b

Answer 1

First question:

Your assumption is correct. The second call to f() will call the varargs method. You can get the compiler to call the second method with:

private void f(int a) {
    f(a, null);
}

Second question:

Yes. However, you can't extend an interface. If you change A to an abstract class, things will compile.