Chapter 9, Problem 7PE

Program Plan Intro

Overriding the method “toString()”

Program plan:

Filename: “Question.java”

This program file is used to define a class “Question”. In the code,

• Define a class “Question”.
  • Define the class members.
  • Define the constructor “Question()”.
    • Set question to the “text”.
    • Set empty answer to “answer”.
  • Define a method “setAnswer()”.
    • Set the “correctResponse” to “answer”.
  • Define a method “checkAnswer()”.
    • Return the value.
  • Define a method “display()”.
    • Print the value of “text”.
  • Define a method “toString()”. And this method overrides the inherited “toString()” method.
    • Return the “text” and “answer” of runtime class.

Filename: “ChoiceQuestion.java”

This program file is used to define a class “ChoiceQuestion”. In the code,

• Import the required packages.
• Define a class “ChoiceQuestion” as extending from “Question”.
  • Define the class member array list “choices”.
  • Define the constructor “ChoiceQuestion()”.
    • Create array list with question and no choices.
  • Define a method “addChoice()”.
    • Add choice to “choices”.
    • If the condition is true,
      • Set “choiceString”.
      • Call “setAnswer()”.
  • Define the method “display()”.
    • Call the method “display()”.
    • Iterate a “for” loop,
      • Set the value of “choiceNumber”.
      • Print the choices.
  • Define the method “toString()”.
    • Return the choices.

Filename: “QuestionTester.java”

This program file is used to define a class “QuestionTester”. In the code,

• Import the required packages.
• Define a class “QuestionTester”.
  • Define the method “main()”.
    • Define the object “q” of “Question”.
    • Get the runtime class using “getClass()”.
    • Get the runtime method using “getMethod()”.
    • Set the value of “isOverridden” as “true” if the method “toString()” is overridden.
    • Print the value of “isOverridden”.
    • Print the expected value.
    • Define the object “q2” of “Question”.
    • Get the runtime class using “getClass()”.
    • Get the runtime method using “getMethod()”.
    • Set the value of “isOverridden” as “true” if the method “toString()” is overridden.
    • Print the value of “isOverridden”.
    • Print the expected value.