Question

Java CSE 135

Which methods does the ChoiceQuestion class inherit from its superclass? Which methods does it override? Which methods does it add?

public class Question{ . . . public void display() { System.out.println(text); }} public class ChoiceQuestion extends Question{ . . . public void display() { super.display(); for (int i = 0; i < choices.size(); i++) { int choiceNumber = i + 1; System.out.println(choiceNumber + ": " + choices.get(i)); } }} public class QuestionDemo{ public static void main(String[] args) { Question q1 = new Question(); ChoiceQuestion q2 = new ChoiceQuestion(); . . . presentQuestion(q1); presentQuestion(q2); . . . }  public static void presentQuestion(Question q) { q.display(); . . . }}

Answer 1

Question class has only one method named display.
ChoiceQuestion inherits from Question class.

Which methods does the ChoiceQuestion class inherit from its superclass? 
display method.

Which methods does it override?
display method. 

Which methods does it add?
None. display method created in ChoiceQuestion overrides the method from Question class. So, technically it is not a newly added method of ChoiceQuestion class.