/*
 * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
 * Date: 2022-04-25
 * Description: This is the User class.
 */

public abstract class User implements IUser {
	/**
	 * The user's name.
	 */
	private String name;

	/**
	 * The number of books borrowed by the user.
	 */
	private int book;

	/**
	 * Constructor.
	 *
	 * @param name The user's name.
	 * @param book The number of books borrowed by the user.
	 */
	public User(String name, int book) {
		this.name = name;
		this.book = book;
	}

	/**
	 * Getter of the user's name.
	 *
	 * @return The user's name.
	 */
	public String getName() {
		return name;
	}

	/**
	 * Getter of the number of books borrowed by the user.
	 *
	 * @return The number of books borrowed by the user.
	 */
	public int getBook() {
		return book;
	}

	/**
	 * Change the number of books borrowed by the user.
	 *
	 * @param book The number of books borrowed by the user.
	 */
	protected void setBook(int book) {
		this.book = book;
	}

	/**
	 * Increase the number of books borrowed by the user.
	 *
	 * @param book The number of books borrowed by the user.
	 */
	public abstract void moreBook(int number);

	/**
	 * Test.
	 */
	public static void testUser() {
		User user = new User("Walter", 3) {
			@Override
			public void moreBook(int number) {
				setBook(getBook() + number);
			}
		};
		System.out.println(user.getName() == "Walter");
		System.out.println(user.getBook() == 3);
		user.moreBook(2);
		System.out.println(user.getBook() == 5);
	}
}