update,

it114105/itp4510/Lab01/Lab1.2/q3/Rectangle.java

@@ -0,0 +1,40 @@
+public class Rectangle extends Shape{
+    private Point topLeft;
+    private double width;
+    private double height;
+
+    public Rectangle(double width, double height, double x, double y) {
+        super("rectangle");
+        topLeft = new Point(x, y);
+        this.width = width;
+        this.height = height;
+    }
+
+    public double getWidth() {
+        return width;
+    }
+
+    public double getHeight() {
+        return height;
+    }
+
+    public Point getTopLeft() {
+        return topLeft;
+    }
+
+    public void setWidth(double width) {
+        this.width = width;
+    }
+
+    public void setHeight(double height) {
+        this.height = height;
+    }
+
+    public double getArea() {
+        return width * height;
+    }
+
+    public String toString() {
+        return "top left=" + topLeft.toString() + "; width=" + width + "; height=" + height;
+    }
+}