swingdemo.java

Java程序设计大学教程程序源代码

/**
 * <p>Title:Swing组件演示程序 </p>
 *
 * <p>Copyright: Copyright (c) 2005</p>
 *
 * <p>Company: 刘艺</p>
 *
 * @author 刘艺
 * @version 1.0
 */

package jbookch6;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;


public class SwingDemo extends SimpleFrame {
    
    /** Creates a new instance of SwingDemo */
    public SwingDemo(int width,int height) {
       //设置顶层容器 
        super(width,height);
        setTitle("演示GUI容器、组件、事件及布局");
        
        //JPanel容器采用缺省的FlowLayout布局
        topPanel.add(nameLabel);
        topPanel.add(nameText);
        topPanel.add(new JLabel("学历"));
        topPanel.add(comboBox);
        
        //创建互斥按钮组
        buttonGroup.add(rb1);
        buttonGroup.add(rb2);
        buttonGroup.add(rb3);
        
        //设置边框
        list.setBorder(BorderFactory.createTitledBorder("文化程度："));
        textArea.setBorder(BorderFactory.createTitledBorder("演示效果:"));
        
        //设置背景色
        textArea.setBackground(new Color(200,220,180));
        
        //BOX容器采用缺省的BoxLayout布局
        box.add(new JLabel("性别："));
        box.add(rb1);
        box.add(rb2);
        box.add(rb3);
        box.add(checkBox);
        
        //JFrame容器采用缺省的BorderLayout布局
        Container c=this.getContentPane();
        c.add(topPanel,"North");
        c.add(list,"East");
        c.add(box,"West");
        c.add(button,"South");
        c.add(new JScrollPane(textArea),"Center");
        
        //演示JList组件选择列表项事件
        list.addListSelectionListener(new ListSelectionListener(){
            public void valueChanged(ListSelectionEvent e){
                if (e.getValueIsAdjusting()) return;
                textArea.append("\n"+(String)(list.getSelectedValue()));
            }
        });
        
        //演示JCheckBox组件选择事件
        checkBox.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                String c="  未选";
                if (checkBox.isSelected() )
                    c="  已选";
                textArea.append("\n"+(String)(checkBox.getText())+c);
            }
        });
        
        //演示JComboBox组件选择列表项事件
        comboBox.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                textArea.append("\n"+(String)(comboBox.getSelectedItem()));
            }
        });
        
        //演示JButton组件点击事件
        button.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                //演示消息框
                JOptionPane.showMessageDialog(null,"演示消息框。",button.getText(),JOptionPane.INFORMATION_MESSAGE);
            }
        });
        
        //演示JTextField组件文本改变事件
        nameText.getDocument().addDocumentListener( new DocumentListener() {
            public void insertUpdate(DocumentEvent e) { textArea.append("\n"+nameText.getText());}
            public void removeUpdate(DocumentEvent e) {textArea.append("\n"+nameText.getText());}
            public void changedUpdate(DocumentEvent e) {}
        } );
        
        //演示JRadioButton组件选择事件
        rb1.addActionListener(rbListener);
        rb2.addActionListener(rbListener);
        rb3.addActionListener(rbListener);
        
    }
    
    //演示3个JRadioButton组件注册的一个共用监听器
    private ActionListener  rbListener = new ActionListener(){
        public void actionPerformed(ActionEvent e){
            textArea.append("\n"+((JRadioButton)e.getSource()).getText());
        }
    };
    
    public static void main(String args[]) {
        try {
            UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
        } catch (Exception e){
            System.err .println("程序异常："+e.getMessage());
        }
        SwingDemo frame=new SwingDemo(400,300);
        frame.setVisible(true);
    }
    
    private JPanel topPanel=new JPanel();
    private JPanel listPanel=new JPanel();
    private Box box=Box.createVerticalBox();
    private JButton button=new JButton("OK");
    private JCheckBox checkBox=new JCheckBox("少数民族");
    private JRadioButton
            rb1=new JRadioButton("男"),
            rb2=new JRadioButton("女"),
            rb3=new JRadioButton("不详",true);
    private ButtonGroup buttonGroup=new ButtonGroup();
    private JComboBox comboBox=new JComboBox(degrees);
    private JList list=new JList(educationalBackground);
    private JTextArea textArea=new JTextArea();
    private JLabel nameLabel=new JLabel("姓名:");
    private JTextField nameText=new JTextField("张三");
    
    private static String[] degrees={"无","学士","硕士","工程硕士","MBA","博士"};
    private static String[] educationalBackground={"小学","初中","高中","大学大专","大学本科","硕士研究生","博士研究生"};
    
}