Close: #1 Lab 7

lab/lab7/Question3/Bird.java

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+/*
+ * 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);
+	}
+}