Java | UML Design - 3 | Author and Book

Suppose You are given a UML design of the Author and Book like below:

A class called Author is designed as shown in the class diagram. It contains:

• Three private member variables: name (String), email (String), and gender (char of either 'm' or 'f' - you might also use a boolean variable called isMale having value of true or false).
• A constructor to initialize the name, email and gender with the given values.
  (There is no default constructor, as there is no default value for name, email and gender.)
• Public getters/setters: getName(), getEmail(), setEmail(), and getGender().
  (There are no setters for name and gender, as these properties are not designed to be changed.)
• A toString() a method that returns "name (gender) at email", e.g., "Tan Ah Teck (m) at ahTeck@somewhere.com".

Let's design a Book class. Assume that a book is written by one (and exactly one) author. The Book class (as shown in the class diagram) contains the following members:

• Four private member variables: name (String), author (an instance of the Author the class we have just created, assuming that each book has exactly one author), price (double), and qty (int).
• The public getters and setters: getName(), getAuthor(), getPrice(), setPrice(), getQty(), setQty().
• A toString() that returns "'book-name' by author-name (gender) at email". You could reuse the Author's toString() method, which returns "author-name (gender) at email".

#Solution: 

#Author.java:

package MorePractice;

public class Author {
    private String name,email;
    private char gender;

    Author(String name, String email, char gender){
        this.name = name;
        this.email = email;
        this.gender = gender;
    }

    public String getName() {
        return name;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public char getGender() {
        return gender;
    }

    public String toString(){
        return name+" ("+gender+") at "+email;
    }
}

#Book.java:

package MorePractice;

public class Book {
    private String name;
    private Author author;
    double price;
    int qty;
    Book(String name, Author author, double price, int qty){
        this.name = name;
        this.author = author;
        this.price = price;
        this.qty = qty;
    }

    public String getName() {
        return name;
    }

    public Author getAuthor() {
        return author;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public int getQty() {
        return qty;
    }

    public void setQty(int qty) {
        this.qty = qty;
    }
    public String toString(){
        return "'"+name+"' by author-"+author;
    }
}

#BookMain.java:

package MorePractice;

public class BookMain {
    public static void main(String[] args) {
        Author a1 = new Author("Humayun Ahmed","himu@humayun.com",'m');
        //System.out.println(a1);
        Book b1 = new Book("Aj Himur Biye",a1,150.00,5);
        System.out.println(b1);
    }
}