Add lab6

lab/lab6/Question4/Dot.java

@@ -0,0 +1,37 @@
+/*
+ * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007).
+ * Date: 2022/03/27
+ * Description: This is the Dot class.
+ */
+
+public class Dot extends Shape {
+	/**
+	 * Constructor
+	 *
+	 * @param x double
+	 * @param y double
+	 */
+	public Dot(double x, double y) {
+		super(x, y);
+	}
+
+	/**
+	 * Override the area method. Dot has no (0.0) area.
+	 *
+	 * @return double
+	 */
+	@Override
+	public double area() {
+		return 0.0;
+	}
+
+	/**
+	 * Test
+	 */
+	public static void testDot() {
+		Dot d1 = new Dot(1.0, 2.0);
+		System.out.println(d1.getX() == 1.0);
+		System.out.println(d1.getY() == 2.0);
+		System.out.println(d1.area() == 0.0);
+	}
+}