Compile time Polymorphism and resolution of `this` keyword

Question

I'm calling an overloaded method of some class ( c.doSomething ), from a class, and I'm passing the class instance as the argument.It is better explained using the following scenario:

public class A {

    protected int do(){
        C.doSomething(this);
    }
}

---

public class B extends A {

    public int doSomething(){
        do();
    }
}

---

public class C{
    public static function doSomething(B b){ System.out.println("b"); }
    public static function doSomething(A a){ System.out.println("a"); }

}

---

Now if I do something like the below in main , which of the doSomething methods will be called from C ?

B b = new B();
b.doSomething();

Answer 1

This is rightfully called "compile time polymorphism" since C.doSomething(A a) is called and we are calling C.doSomething inside A . It is interesting to note that putting a getClass() inside A.do will yield "B" when b.doSomething is called.