/*
 * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
 * Date: 2022/04/03
 * Description: This is the abstract class of Bird.
 */

public abstract class Bird extends Animal {
	/**
	 * An integer indicate how many eggs the bird has.
	 */
	private int numOfEggs;

	/**
	 * A constructor of Bird.
	 * 
	 * @param name      The name of the bird.
	 * @param numOfEggs The number of eggs the bird has.
	 */
	public Bird(String name, int numOfEggs) {
		super(name);
		this.numOfEggs = numOfEggs;
	}

	/**
	 * Getter of numOfEggs.
	 *
	 * @return The number of eggs the bird has.
	 */
	public int getNumOfEggs() {
		return numOfEggs;
	}

	/**
	 * Bird have 2 legs.
	 *
	 * @return int
	 */
	@Override
	public int getLegs() {
		return 2;
	}

	/**
	 * Abstract method of canFly. Some birds can fly (for example magpies) and some
	 * birds cannot fly (for example ostriches).
	 */
	public abstract boolean canFly();

	/**
	 * Test.
	 */
	public static void testBird() {
		Bird b1 = new Bird("magpie", 1) {
			@Override
			public boolean canFly() {
				return true;
			}
		};
		System.out.println(b1.getName() == "magpie");
		System.out.println(b1.getNumOfEggs() == 1);
		System.out.println(b1.canFly() == true);
		System.out.println(b1.getLegs() == 2);

		Bird b2 = new Bird("ostriches", 2) {
			@Override
			public boolean canFly() {
				return false;
			}
		};
		System.out.println(b2.getName() == "ostriches");
		System.out.println(b2.getNumOfEggs() == 2);
		System.out.println(b2.canFly() == false);
		System.out.println(b2.getLegs() == 2);
	}
}