jlayeredpane1.java

深入浅出JAVA Swing程序设计光盘代码.新书,相当不错

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class JLayeredPane1 extends JFrame
{
    public JLayeredPane1()
    {
        super("JLayeredPane");
        Integer[] layerConstants = { JLayeredPane.DEFAULT_LAYER,
        JLayeredPane.PALETTE_LAYER, new Integer(101), 
        JLayeredPane.MODAL_LAYER, new Integer(201),
        JLayeredPane.POPUP_LAYER, JLayeredPane.DRAG_LAYER };
        
        Color[] colors = { Color.red, Color.blue,
                                Color.magenta,Color.cyan ,
                                Color.yellow,Color.green,
                                Color.pink };
                                    
        Point position = new Point(10,10);
        JLabel[] label = new JLabel[7];
        JLayeredPane layeredPane = getLayeredPane();
        
        for (int i=0 ; i<7; i++)
        {
            label[i] = createLabel("第 "+(i+1)+" 层",colors[i],position);
            position.x = position.x+20;
            position.y = position.y+20;
            layeredPane.add(label[i],layerConstants[i]);
        }

        setSize(new Dimension(280, 280));
        show();
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                    System.exit(0);
            }
        });
    }
    
    public JLabel createLabel(String content, 
                              Color color,
                              Point position)
   {
        JLabel label = new JLabel(content,JLabel.CENTER);
        label.setVerticalAlignment(JLabel.TOP);
        label.setBackground(color);
        label.setForeground(Color.black);
        label.setOpaque(true);
        label.setBounds(position.x, position.y, 100, 100);
        return label;
    }
    
    public static void main(String[] arg)
    {
        new JLayeredPane1();
    }
}