Java Reference
In-Depth Information
ch02/rectangles/RectangleViewer.java
1
import
javax.swing.JFrame;
2
3
public class
RectangleViewer
4 {
5
public static void
main(String[] args)
6 {
7 JFrame frame =
new
JFrame();
8 frame.setSize(
300
,
400
);
9 frame.setTitle(
ÐTwo rectanglesÑ
);
10 frame.setDefaultCloseOperation(JFrame.EXIT
11
12 RectangleComponent component =
new
RectangleComponent();
13 frame.add(component);
14
15 frame.setVisible(
true
);
16 }
17 }
Note that the rectangle drawing program consists of two classes:
ȗ
The
RectangleComponent
class, whose
paintComponent
method
produces the drawing
ȗ
The
RectangleViewer
class, whose
main
method constructs a frame and a
RectangleComponent
, adds the component to the frame, and makes the
frame visible
62
63
S
ELF
C
HECK
29.
How do you modify the program to draw two squares?
30.
How do you modify the program to draw one rectangle and one square?
31.
What happens if you call
g.draw(box)
instead of
g2.draw(box)
?
