Add lab6

lab/lab6/Question1/Shape.java

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+/**
+ * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007) Date: 2022/03/27
+ * Description: This is the Shape class.
+ */
+
+public class Shape {
+	private double x;
+	private double y;
+
+	/**
+	 * Constructor
+	 *
+	 * @param x the position of the center point of the shape
+	 * @param y the position of the center point of the shape
+	 */
+	public Shape(double x, double y) {
+		this.x = x;
+		this.y = y;
+	}
+
+	/**
+	 * Getter of x
+	 *
+	 * @return the position of the center point of the shape
+	 */
+	public double getX() {
+		return x;
+	}
+
+	/**
+	 * Getter of y
+	 *
+	 * @return the position of the center point of the shape
+	 */
+	public double getY() {
+		return y;
+	}
+
+	/**
+	 * The are of the shape
+	 *
+	 * @return the area of the shape
+	 */
+	public double area() {
+		System.out.println("An unknown shape has an unknown area!");
+		return -1.0;
+	}
+
+	/**
+	 * Test
+	 */
+	public static void testShape() {
+		Shape s = new Shape(1.0, 2.0);
+		System.out.println(s.getX() == 1.0);
+		System.out.println(s.getY() == 2.0);
+		System.out.println(s.area() == -1.0);
+	}
+}