simplelayers.java

java swing 开发代码

// SimpleLayers.java
// A demonstration of the JLayeredPane class.
//
package	jswing.ch08;

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

public class SimpleLayers extends JFrame {
  public SimpleLayers() {
    super("LayeredPane Demonstration");
    setSize(200, 150);
    setDefaultCloseOperation(EXIT_ON_CLOSE);

    JLayeredPane lp = getLayeredPane();

    // Create 3 buttons
    JButton top = new JButton();
    top.setBackground(Color.white);
    top.setBounds(20, 20, 50, 50);
    JButton middle = new JButton();
    middle.setBackground(Color.gray);
    middle.setBounds(40, 40, 50, 50);
    JButton bottom = new JButton();
    bottom.setBackground(Color.black);
    bottom.setBounds(60, 60, 50, 50);

    // Place the buttons in different layers
    lp.add(middle, new Integer(2));
    lp.add(top, new Integer(3));
    lp.add(bottom, new Integer(1));
  }

  public static void main(String[] args) {
    SimpleLayers sl = new SimpleLayers();
    sl.setVisible(true);
  }
}