@Override
public int compareTo(Object obj) {
if (obj instanceof Shape) {
Shape shape = (Shape) obj;
if (this.area() > shape.area()) return 1;
else if (this.area() == shape.area()) return 0;
else return -1;
} else {
return 9999999;
}
}
public double totalArea() {
double tot = 0;
for (Shape s : shape) {
tot += s.area();
}
return tot;
}
@Test
public void twentyFor4x5RectangleFromSquare() throws Exception {
final Rectangle rectangle = new Rectangle();
rectangle.setWidth(5);
rectangle.setHeight(4);
final Square square = new Square();
square.setSideLength(3);
List<Shape> shapes =
new ArrayList<Shape>() {
{
add(rectangle);
add(square);
}
};
List<Integer> areas = new ArrayList<Integer>();
for (Shape shape : shapes) {
areas.add(shape.area());
}
assertEquals(20, areas.get(0).intValue());
assertEquals(9, areas.get(1).intValue());
}
public static void main(String args[]) {
// declare an array of shapes, which will accept points or circles
Shape shapes[] = new Shape[3];
// adding one point and one circle
shapes[0] = new Point(5, 1);
shapes[1] = new Circle(2.5, 10, 5);
shapes[2] = new Cylinder(3.6, 4.2);
// Use the array reference object to display the correct information via polymorphism
// this block only uses methods defined for all shapes, so
// it will work for any shape that happens to be in the array
for (Shape s : shapes) {
System.out.println(s.getName() + ": " + s.toString() + "\nArea is " + s.area());
}
}