Java Reference
In-Depth Information
33
/** Return height */
34
public double
getHeight() {
35
return
height;
36 }
37
38
/** Set a new height */
39
public void
setHeight(
double
height) {
40
this
.height = height;
41 }
42
43
/** Return area */
44
public double
getArea() {
45
return
width * height;
46 }
47
48
/** Return perimeter */
49
public double
getPerimeter() {
50
return
2
* (width + height);
51 }
52 }
The code in Listing 11.4 creates objects of
Circle
and
Rectangle
and invokes the methods
on these objects. The
toString()
method is inherited from the
GeometricObject
class
and is invoked from a
Circle
object (line 5) and a
Rectangle
object (line 13).
L
ISTING
11.4
TestCircleRectangle.java
1
public class
TestCircleRectangle {
2
public static void
main(String[] args) {
3
4
5 System.out.println(
"A circle "
+
CircleFromSimpleGeometricObject circle =
new
CircleFromSimpleGeometricObject(
1
);
Circle
object
invoke
toString
invoke
getColor
circle.toString()
);
circle.getColor()
6 System.out.println(
"The color is "
+
);
7 System.out.println(
"The radius is "
+
circle.getRadius()
);
circle.getArea()
8 System.out.println(
"The area is "
+
);
9 System.out.println(
"The diameter is "
+
circle.getDiameter()
);
10
11
12
13 System.out.println(
"\nA rectangle "
+
RectangleFromSimpleGeometricObject rectangle =
new
RectangleFromSimpleGeometricObject(
2
,
4
);
Rectangle
object
invoke
toString
rectangle.toString()
);
rectangle.getArea()
14 System.out.println(
"The area is "
+
);
15 System.out.println(
"The perimeter is "
+
16
rectangle.getPerimeter()
);
17 }
18 }
A circle created on Thu Feb 10 19:54:25 EST 2011
color: white and filled: false
The color is white
The radius is 1.0
The area is 3.141592653589793
The diameter is 2.0
A rectangle created on Thu Feb 10 19:54:25 EST 2011
color: white and filled: false
The area is 8.0
The perimeter is 12.0
