[JAVA100例]013、复合下拉列表
时间:2011-01-08
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import java.util.*;
import java.text.SimpleDateFormat;
/**
* <p>Title: ComboBox下拉域演示</p>
* <p>Description: 通过选择或这输入一种日期格式来格式化今天的日期</p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Filename: ComboBoxDemo.java</p>
* @version 1.0
*/
public class ComboBoxDemo extends JPanel
implements ActionListener {
static JFrame frame;
JLabel result;
String currentPattern;
/**
*<br>方法说明：构造器。初始化窗体构件
*<br>输入参数：
*<br>返回类型：
*/
public ComboBoxDemo() {
setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
String[] patternExamples = {
"dd MMMMM yyyy",
"dd.MM.yy",
"MM/dd/yy",
"yyyy.MM.dd G ´at´ hh:mm:ss z",
"EEE, MMM d, ´´yy",
"h:mm a",
"H:mm:ss:SSS",
"K:mm a,z",
"yyyy.MMMMM.dd GGG hh:mm aaa"
};
currentPattern = patternExamples[0];
//设置一个规范的用户界面
JLabel patternLabel1 = new JLabel("输入一个字符格式或者");
JLabel patternLabel2 = new JLabel("从下拉列表中选择一种：");
JComboBox patternList = new JComboBox(patternExamples);
patternList.setEditable(true);//标注这里ComboBox可进行编辑
patternList.addActionListener(this);
//创建一个显示结果用户界面
JLabel resultLabel = new JLabel("当前 日期/时间",
JLabel.LEADING);//相当于LEFT
result = new JLabel(" ");
result.setForeground(Color.black);
result.setBorder(BorderFactory.createCompoundBorder(
BorderFactory.createLineBorder(Color.black),
BorderFactory.createEmptyBorder(5,5,5,5)
));
//布置构件
JPanel patternPanel = new JPanel();
patternPanel.setLayout(new BoxLayout(patternPanel,
BoxLayout.PAGE_AXIS));
patternPanel.add(patternLabel1);
patternPanel.add(patternLabel2);
patternList.setAlignmentX(Component.LEFT_ALIGNMENT);
patternPanel.add(patternList);
JPanel resultPanel = new JPanel(new GridLayout(0, 1));
resultPanel.add(resultLabel);
resultPanel.add(result);
patternPanel.setAlignmentX(Component.LEFT_ALIGNMENT);
resultPanel.setAlignmentX(Component.LEFT_ALIGNMENT);
add(patternPanel);
add(Box.createRigidArea(new Dimension(0, 10)));
add(resultPanel);
setBorder(BorderFactory.createEmptyBorder(10,10,10,10));
reformat();
}
/**
*<br>方法说明：事件处理
*<br>输入参数：
*<br>返回类型：
*/
public void actionPerfo
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