Which of the following statements are true?

Question

 public class CreditCard {

   private String cardID;
   private Integer limit;
   public String ownerName;

   public void setCardlnformation(String cardID, String ownerName, Integer limit) {
     this.cardID = cardID;
     this.ownerName = ownerName;
     this.limit = limit;
    }
 }

Which is true and Why ?

A. The class is fully encapsulated.
B. The code demonstrates polymorphism.
C. The ownerName variable breaks encapsulation.
D. The cardlD and limit variables break polymorphism.
E. The setCardlnformation method breaks encapsulation

Answer 1

Just an answer:

C. The ownerName variable breaks encapsulation.

When part of the internal state of an object (a variable) is public, any object can directly access it, thus breaking encapsulation

Answer 2

C. The ownerName variable breaks encapsulation.

ownerName should be declared as private and should only be accessible via a getter or setter or something like the 'setCardlnformation' method

Answer 3

C is right - because ownerName can be modified without using any API methods. A is false because of C B, D is false, because in code there is nothing about polymorphism.