import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JLayeredPaneDemo1 extends JFrame {
public JLayeredPaneDemo1(){
super("JLayeredPaneDemo1");
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[] labels = new JLabel[7];
JLayeredPane layeredPane = this.getLayeredPane();
JLabel temp_label = new JLabel("content pane");
temp_label.setBounds(100,100,400,400);
temp_label.setOpaque(true);
this.getContentPane().add(temp_label);
layeredPane.add(temp_label);//會覆蓋content pane中的temp_label
for(int i=0;i<7;i++){
labels[i] = createLabel("第"+(i+1)+"層",colors[i],position);
position.x = position.x+20;
position.y = position.y+20;
layeredPane.add(labels[i],layerConstants[i]);
}
this.setSize(new Dimension(500,500));
JButton button1 = new JButton("button1");
button1.setOpaque(true);
button1.setBackground(Color.black);
button1.setForeground(Color.blue);
button1.setBounds(new Rectangle(0,0,200,200));
JButton button2 = new JButton("button2");
button2.setOpaque(true);
button2.setBackground(Color.green);
button2.setForeground(Color.red);
button2.setBounds(new Rectangle(100,100,200,200));//setBounds一定不能省,否則顯示不出來。而content pane中就不需要手動來設置Bounds
layeredPane.add(button1,new Integer(10),1);
layeredPane.add(button2,new Integer(10),-1);
this.setVisible(true);
this.addWindowListener(new WindowAdapter(){
@Override
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.setOpaque(true);
label.setBounds(position.x,position.y,100,100);
return label;
}
public static void main(String...args){
new JLayeredPaneDemo1();
}
}
參考:深入淺出Java Swing程序設計