Question

I wanted to know whether it is possible to implement code like this?

public interface A {
public void execute();
}

public interface B { 
    public String execute(); 
}

class C implements A, B {
}

Answer 1

No. This is not allowed, as the compiler would be unable to tell which version of execute you want to use.

If you want to overload methods, you need to vary the method parameters, e.g.:

   public void execute();

   public String execute(int someParam);