Hands-On Design Patterns with Java

Book class

The Book class establishes the class structure with three class variables: isbn, title, and year. Accessor and mutator (getters and setters) methods are provided for each of the class variables:

public class Book {    private String isbn;    private String title;    private int year;    // accessor methods    public String getISBN() {        return isbn;    }    public String getTitle() {        return title;    }    public int getYear() {        return year;    }    // mutator methods    public void setISBN(String isbn) {        this.isbn = isbn;    }    public void setTitle(String title) {        this.title = title;    }    public void setYear(int year) {        this.year = year;    }}

The Book class defined previously represents the model component of our MVC architectural pattern.