Passing Null which mehod is called?

[Swati Kadam]

class A { }

class B extends A { }

class C extends B {
static void doSomething ( A x , A y ) {System.out.print("AA");}
static void doSomething ( A x , B y ) {System.out.print("AB");}
static void doSomething ( B x , A y ) {System.out.print("BA");}
static void doSomething ( B x , B y ) {System.out.print("BB");}
static void doSomething ( C x , C y ) { System.out.println("CC");}

public static void main(String[] args) {
doSomething(null,null);
}
}
Output is CC;
Why it calls "static void doSomething ( C x , C y ) " eventhough other methods also can accpet the null argument???

[Sheryl Pinto]

From the K&B book, Chpt3 - Overloading made Hard

"In every case, when an exact match isn't found, the JVM uses the method with the smallest argument that is wider than the parameter."

which I guess in this case would be:

static void doSomething ( C x , C y )

[Andriy Fedotov]

Not only the smallest number of arguments, but also "the more specialized one".

class A{}
class B extends A{}
class C{
void method(A a)(){}
void method(B b)(){}
 
public static void main(){
  new C().method(null);
}
}

method B will be called

[marc weber]

See our SCJP FAQ: What is a most-specific method?

[Andriy Fedotov]

whew!
didn't notice that there's already descriptions of classes A,B,C.
Could not write my code - you have the same.

Once again - the more specialized one will be called