lab8 q1

lab/lab8/Question1/Shape.java

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+/*
+ * Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
+ * Date: 2022-04-15
+ * Description: This is the abstract Shape class.
+ */
+
+public abstract class Shape {
+	/*
+	 * Store the position of the central point of the shape.
+	 */
+	private double x;
+	private double y;
+
+	/**
+	* Constructor of the Shape class.
+	*
+	* @param x the x-coordinate of the central point of the shape.
+	* @param y the y-coordinate of the central point of the shape.
+	*/
+	public Shape(double x, double y) {
+		this.x = x;
+		this.y = y;
+	}
+
+	/**
+	 * Getter of the x coordinate of the central point of the shape.
+	 *
+	 * @return the x coordinate of the central point of the shape.
+	 */
+	public double getX() {
+		return x;
+	}
+
+	/**
+	 * Getter of the y coordinate of the central point of the shape.
+	 *
+	 * @return the y coordinate of the central point of the shape.
+	 */
+	public double getY() {
+		return y;
+	}
+
+	/**
+	 * Move the central point of the shape by amounts dx and dy.
+	 *
+	 * @param dx the amount of movement in x direction.
+	 * @param dy the amount of movement in y direction.
+	 */
+	public void move(double dx, double dy) {
+		x += dx;
+		y += dy;
+	}
+	
+	/**
+	 * Abstract method to calculate the area of the shape.
+	 *
+	 * @return the area of the shape.
+	 */
+	public abstract double area();
+
+	/**
+	 * Abstract method to resize the shape.
+	 *
+	 * @param newSize the new size of the shape.
+	 */
+	public abstract void resize(double newSize);
+
+	/**
+	 * Test.
+	 */
+	public static void testShape() {
+		Shape s = new Shape(3.9, 4.2) {
+			@Override
+			public double area() {
+				return 0;
+			}
+
+			@Override
+			public void resize(double newSize) {
+			}
+		};
+		System.out.println(s.getX() == 3.9);
+		System.out.println(s.getY() == 4.2);
+		s.move(1.0, 2.0);
+		System.out.println(s.getX() == 4.9);
+		System.out.println(s.getY() == 6.2);
+	}
+}

lab/lab8/Question1/Start.java

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+public class Start {
+	public static void main(String[] args) {
+		Shape.testShape();
+	}
+}