Question

Book:

- title: String

- price: double

+Book()

+Book(String, double)

+getTitle(): String

+setTitle(String): void

+getPrice(): double

+setPrice(double): void

+toString(): String

The class has two attributes, title and price, and get/set methods for the two attributes. The first constructor doesn’t have a parameter. It assigns “” to title and 0.0 to price; The second constructor uses passed-in parameters to initialize the two attributes. The toString() method returns values for the two attributes. Notation: - means private, and + means public.

1. Define the Book.java class. 2. define another class named BookApp.java which has a main() method. 3. create a Book object, named b1, by calling the first Book constructor. Then using the object b1 to call setTitle() and setPrice() methods to assign “John Doe” to title and 8.1 to price. using b1 to call toString() method and print the returned value from the toString() method. create another Book object, named b2, by calling the second Book constructor and passing Ann Smith as the first argument and 9.2 as the second argument. using b2 to call toString() method and print the returned value from the toString() method.

in JAVA (NetBeans IDE 8.2)

Answer 1

Dear Student ,

As per the requirement submitted above , kindly find the below solution.

Here below java classes are created.

Book.java :

//Java class
public class Book {
//attributes
   private String title;
   private double price;
   //default constructor
   public Book()
   {
       this.title="";//set title to empty string
       this.price=0.0;//set price to 0
   }
   //parameterized constructor
   public Book(String t, double p)
   {
       this.title=t;
       this.price=p;
   }
   //getter methods
   public String getTitle() {
       return this.title;//return title
   }
   public double getPrice() {
       return this.price;//return price
   }
   //setter methods
   public void setTitle(String t)
   {
       this.title=t;//set title
   }
   public void setPrice(double p)
   {
       this.price=p;//set price
   }
   //method to return title and price
   public String toString()
   {
       return "Title : "+this.title+", Price : "+this.price;//return title and price
   }
}

**********************************

BookApp.java :

//Java class
public class BookApp {
   //entry point of class , main method
   public static void main(String[] args) {
       //creating object of Book class
       Book b1=new Book();
       b1.setTitle("John Doe");//set title
       b1.setPrice(8.1);//set price
       //print title and price using b1
       System.out.println(b1.toString());
       //creating object of Book class
       Book b2=new Book("Ann Smith",9.2);
       //print title and price using b2
       System.out.println(b2.toString());
   }

}

======================================================

Output : Compile and Run BookApp.java to get the screen as shown below

Screen 1 :BookApp.java

NOTE : PLEASE FEEL FREE TO PROVIDE FEEDBACK ABOUT THE SOLUTION.