Exam sample, I wonder if I understood

Question

The question arises:

Suppose you oare a type reference Objectthat points to an object of a type Athat contains a method fand a method toString. Both parameters toStringand fhave no parameters. show the operator that calls the method toStringand the operator that calls the method f.

- answer:

 f();
 toString();

Answer 1

No, it is not. First of all, you are not using an instance oto call methods. Without specifying an instance, the compiler will force these methods to implicitly call this.

-, o.f(), f Object. , , o A.

Object o = new A();
String s = o.toString();
((A)o).f();

.

• ( Java)

Answer 2

, . f toString A, .

f toString A , A, , :

A myA = new A();  // Assuming the existence of a no-args constructor
myA.f();
myA.toString();

Object, f, A.