Question

1. Create a Java project called Lab3B and a class named Lab3B.
2. Create a second new class named Book.
3. In the Book class:
   1. Add the following private instance variables:
      1. title (String)
      2. author (String)
      3. rating (int)
   2. Add a constructor that receives 3 parameters (one for each instance variable) and sets each instance variable equal to the corresponding variable.
   3. Add a second constructor that receives only 2 String parameters, inTitle and inAuthor. This constructor should only assign input parameter values to title and author. rating won’t be given a value here.
   4. Add a public String method named getTitle (no parameter) that returns title.
   5. Add a void method named setRating with an int parameter (inRating). It will set rating equal to inRating.
   6. Add a public String method toString (no parameters). It should create and return a String variable with all the book’s instance data (like you did in the Employee class.)
4. Back in the main Lab3B class.
   1. Declare and instantiate a Book object named book1 sending the following parameters to the constructor ("A Tale of Two Cities", "Charles Dickens", 4)
   2. Declare and instantiate a Book object named book2 sending the following parameters to the constructor ("Foundation", "Isaac Asimov")
   3. Call setRating for book2 sending 5 as a parameter.
   4. Call getTitle for book1 and print the returned value.
   5. Use our toString shortcut to print all of book1’s information.
   6. Print a blank line.
   7. Use the same coding to print all of book2’s info.

Your output should be:

A Tale of Two Cities

Title: A Tale of Two Cities

Author: Charles Dickens

Rating: 4

Title: Foundation

Author: Isaac Asimov

Rating: 5

Answer 1

In case of any query do comment. Thanks

Code:

Book.java

//class Book
public class Book {
    //a. private instance variable  
    private String title;
    private String author;
    private int rating;
    
    //b. constructor with three parameters
    public Book(String inTitle, String inAuthor, int inRating){
        this.title = inTitle;
        this.author = inAuthor;
        this.rating = inRating;
    }
    
    //c. constructor with two parameters
    public Book(String inTitle, String inAuthor){
        this.title = inTitle;
        this.author = inAuthor;
    }
    
    //d. method to return title
    public String getTitle(){
        return this.title;
    }
    
    //e. method to setRating
    public void setRating(int inRating){
        this.rating = inRating;
    }
    
    //f. toString to return string representation of an object
    public String toString(){
        return "Title: " + this.title + "\nAuthor: " + this.author + "\nRating: " + this.rating;
    }
}

Lab3B.java

public class Lab3B
{
        public static void main(String[] args) {
                //a, declare an object book1
                Book book1 = new Book("A Tale of Two Cities", "Charles Dickens", 4);
                //b. create an object book2 with two parameter constructor
                Book book2 = new Book ("Foundation", "Isaac Asimov");
                //c. call setRating on book2 with value 5
                book2.setRating(5);
                //d. call getTitle on book 1 and print the return value
                System.out.println(book1.getTitle());
                //e.Use our toString shortcut to print all of book1’s information.
                System.out.print(book1);
                //f. Print a blank line.
                System.out.println();
                //g. Use the same coding to print all of book2’s info.
                System.out.print(book2);
                
        }
}

============screen shot of the code========

output: