Java Reference
In-Depth Information
L
ISTING
17.4
ComboBoxDemo.java
1
import
java.awt.*;
2
import
java.awt.event.*;
3
import
javax.swing.*;
4
5
public class
ComboBoxDemo
extends
JFrame
{
6
// Create an array of Strings for flag titles
7
private
String[] flagTitles
= {
"Canada"
,
"China"
,
"Denmark"
,
country
8
"France"
,
"Germany"
,
"India"
,
"Norway"
,
"United Kingdom"
,
9
"United States of America"
};
10
11
// Declare an ImageIcon array for the national flags of 9 countries
12
private
ImageIcon[] flagImage
= {
image icon
13
new
ImageIcon(
"image/ca.gif"
),
14
new
ImageIcon(
"image/china.gif"
),
15
new
ImageIcon(
"image/denmark.gif"
),
16
new
ImageIcon(
"image/fr.gif"
),
17
new
ImageIcon(
"image/germany.gif"
),
18
new
ImageIcon(
"image/india.gif"
),
19
new
ImageIcon(
"image/norway.gif"
),
20
new
ImageIcon(
"image/uk.gif"
),
21
new
ImageIcon(
"image/us.gif"
)
22 };
23
24
// Declare an array of strings for flag descriptions
25
private
String[] flagDescription
=
new
String[
9
];
description
26
27
// Declare and create a description panel
28
private
DescriptionPanel descriptionPanel =
new
DescriptionPanel();
29
30
// Create a combo box for selecting countries
31
32
33
public static void
main(String[] args) {
34 ComboBoxDemo frame =
new
ComboBoxDemo();
35 frame.pack();
36 frame.setTitle(
"ComboBoxDemo"
);
37 frame.setLocationRelativeTo(
null
);
// Center the frame
38 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
39 frame.setVisible(
true
);
40 }
41
42
public
ComboBoxDemo() {
43
// Set text description
44 flagDescription[
0
] =
"The Canadian national flag..."
;
45 flagDescription[
1
] =
"Description for China ... "
;
46 flagDescription[
2
] =
"Description for Denmark ... "
;
47 flagDescription[
3
] =
"Description for France ... "
;
48 flagDescription[
4
] =
"Description for Germany ... "
;
49 flagDescription[
5
] =
"Description for India ... "
;
50 flagDescription[
6
] =
"Description for Norway ... "
;
51 flagDescription[
7
] =
"Description for UK ... "
;
52 flagDescription[
8
] =
"Description for US ... "
;
53
54
// Set the first country (Canada) for display
55 setDisplay(
0
);
56
57
// Add combo box and description panel to the frame
58 add(jcbo, BorderLayout.NORTH);
private
JComboBox jcbo =
new
JComboBox(flagTitles);
combo box
create UI
