This article is the third article in the series of Object Oriented Programming tutorials, explaining the OOP concept - Inheritance. The same problem used in the Encapsulation tutorial is used here to explain Inheritance. The ABC book shop needs a software to maintain its billing procedures and stock management. This book shop sells books, magazines, newsletters and DVDs. In the last tutorial, we have developed a Book class.
public class Book {
private String title;
private String author;
private double price;
public String getTitle() {
return this.title;
}
public void setTitle(String title) {
this.title = title;
}
public String getAuthor() {
return this.author;
}
public void setAuthor(String author) {
this.author = author;
}
public void setPrice(double price) {
if (price > 0) {
this.price = price;
} else {
System.out.println("Invalid price");
}
}
public double getPrice() {
return this.price;
}
public void sell(int qty) {
System.out.println("Total: $" + (qty * price));
}
}
This time we are going to create a Magazine class with the following attributes and behaviors. Do not forget to use encapsulation when creating the class.
