ITEEDU

11-2-3:输出Input Dialog:

Input Dialog可以让用户输入相关信息,当用户按下确定钮后,系统会得到用户所输入的信息.输入对话框不仅可以让用户自输入 文字,也可以显示出ComboBox组件让用户选择相关信息,避免用户输入错误,当用户输入完毕按下确定按钮时会返回用户输入的信息, 若按下取消则返回null值.下面为InputDialog的范例.

InputDialog.java

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.*;
import com.incors.plaf.alloy.*;
import com.incors.plaf.alloy.themes.glass.*;

public class InputDialog implements ActionListener
{
    JFrame f = null;
    JLabel label = null;
    
    public InputDialog() 
    {
        f = new JFrame("OptionPane Demo");
        Container contentPane = f.getContentPane();
        
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(1,2));
        
        JButton b = new JButton("Show Text Input");
        b.addActionListener(this);
        panel.add(b);
        b = new JButton("Show ComboBox Input");
        b.addActionListener(this);
        panel.add(b);
        
        label = new JLabel(" ",JLabel.CENTER);
        contentPane.add(label,BorderLayout.NORTH);
        contentPane.add(panel,BorderLayout.CENTER);
        f.pack();
        f.setVisible(true);
        
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }    
    
    public static void main(String[] args)
    {
    	SwingUtil.setLookAndFeel();
        new InputDialog();
    }
    
    public void actionPerformed(ActionEvent e) 
    {
        String cmd = e.getActionCommand();
        String title = "Input Dialog";
        String message ="您最熟悉哪一种程序语言？";
        int messageType = JOptionPane.QUESTION_MESSAGE;
        String[] values = {"JAVA","PHP","ASP","C++","VB"};
        String result ="";

        if(cmd.equals("Show Text Input")) {
            result = JOptionPane.showInputDialog(f, message, 
                     title, messageType);
            
        } else if(cmd.equals("Show ComboBox Input")) {
            result = (String)JOptionPane.showInputDialog(f, message, 
                     title, messageType,null,values,values[0]);
        }
    
        if (result == null)
            label.setText("您取消了对话框");
        else{
            label.setText("您输入："+result);
        }
    }
}
class SwingUtil{
  public static final void setLookAndFeel() {
  	try{
            Font font = new Font("JFrame", Font.PLAIN, 12);
            Enumeration keys = UIManager.getLookAndFeelDefaults().keys();
 
            while (keys.hasMoreElements()) {
               Object key = keys.nextElement();
               if (UIManager.get(key) instanceof Font) {
                  UIManager.put(key, font);
                }
            } 
        	AlloyLookAndFeel.setProperty("alloy.isLookAndFeelFrameDecoration", "true");
        	AlloyTheme theme = new GlassTheme();
        	LookAndFeel alloyLnF = new AlloyLookAndFeel(theme);
            UIManager.setLookAndFeel(alloyLnF);
  	}catch(UnsupportedLookAndFeelException ex){
  	  ex.printStackTrace();	
  	}
 }
}