Question 1: Which of the following is true? Select all that apply. e. Constructo

Question

Question 1:

Which of the following is true? Select all that apply.

e. Constructors are used to initialize instance variables.

Question 2:

Write a class header for a class that would represent a car.

-----------------------------------------------------

In the next few questions, write a complete class called Book (described below).

A book is described by a title, author, ISBN code (see below), and publication year.

ISBN code is a unique 13-digit code assigned to all books. Codes might contain dashes. For example, the code for our textbook is 978-0133807806.

Question 3:

Write the class header and the instance data variables for the Book class.

Question 4:

Write a constructor for the Book class. The constructor should initialize the instance data variables using parameters.

Question 5:

Write accessor and mutator (getter and setter) methods. Include validity checking where appropriate.

Question 6:

Write a toString method to return a nicely formatted, multi-line description of the book.

Question 7:

Write code that would go inside of a main method.

The code should create three book objects and invoke at least two methods on each object. Also include a statement to print a text representation of one of the books to the console.

Explanation / Answer

Answer)

Question 1:
Which of the following is true? Select all that apply.
    a. Constructors can invoke other methods in the class. - True. A constructor can be used to invoke other methods in the class in Java.
    b. A class can only have one constructor.       - False. A class can have a default constructor and also parametrized constructors.
    c. Constructors always have the same name as the class. - True. Constructors are named same as the class name so that the compiler knows before hand which method to call when an object is created.
    d. The compiler always creates a default constructor (a constructor with no arguments) for a class. - True. The compiler creates a default constructor even if you do not explicitly define one.
    e. Constructors are used to initialize instance variables. - True. Constructors in Java are used to initialize instance variables. It is the ideal point to initialize instance variables.
  
  

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.