如何实现3层依次Overlay的JPanel（大小相同），而且每层JPanel均为可见，即上2层的JPanel为“透明”

Question

什么叫“每层JPanel均为可见，即上2层的JPanel为“透明”” 不过你可以参考JLayerredPane

Answer 1

可以设一下上面两层的Visiable为假试试

Answer 2

形象地说比如有3张同样大小的纸每张上都画有文字，方块和圆圈等图形将3张纸叠在成一张从上往下看要求可以看到3张纸上所有的文字和图形也就是说，最上面那张和中间那张纸，实际上要变成一张透明的塑料薄膜大家明白了么有法子么JPanel层叠是可以的但是如何让JPanel的背景变成透明的塑料薄膜阿

Answer 3

package test1;import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.borland.jbcl.layout.*;/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */public class Frame1 extends JFrame {
  JPanel contentPane;
  BorderLayout borderLayout1 = new BorderLayout();
  JLayeredPane jLayeredPane1 = new JLayeredPane();
  OverlayLayout2 overlayLayout21 = new OverlayLayout2();
  JPanel jPanel1 = new JPanel();
  JButton jButton1 = new JButton();
  JPanel jPanel2 = new JPanel();
  JButton jButton2 = new JButton();
  BorderLayout borderLayout2 = new BorderLayout();
  BorderLayout borderLayout3 = new BorderLayout();
  JPanel jPanel3 = new JPanel();
  JButton jButton3 = new JButton();
  BorderLayout borderLayout4 = new BorderLayout();  //Construct the frame
  public Frame1() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  //Component initialization
  private void jbInit() throws Exception  {
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(borderLayout1);
    this.setSize(new Dimension(530, 446));
    this.setTitle("Frame Title");
    jLayeredPane1.setBackground(SystemColor.info);
    jLayeredPane1.setLayout(overlayLayout21);
    jPanel1.setBackground(Color.pink);
    jPanel1.setLayout(borderLayout2);
    jPanel1.setOpaque(false);
    jButton1.setText("jButton1");
    jPanel2.setBackground(Color.green);
    jPanel2.setLayout(borderLayout3);
    jPanel2.setOpaque(false);
    jButton2.setText("jButton2");
    jPanel3.setBackground(SystemColor.desktop);
    jPanel3.setLayout(borderLayout4);
    jPanel3.setOpaque(false);
    jButton3.setText("jButton3");
    contentPane.add(jLayeredPane1, BorderLayout.CENTER);
    jLayeredPane1.add(jPanel1, null);
    jPanel1.add(jButton1, BorderLayout.NORTH);
    jLayeredPane1.add(jPanel2, null);
    jPanel2.add(jButton2, BorderLayout.EAST);
    jLayeredPane1.add(jPanel3, null);
    jPanel3.add(jButton3, BorderLayout.SOUTH);
  }
  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }
}

Answer 4

package test1;import javax.swing.UIManager;
import java.awt.*;/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author not attributable
 * @version 1.0
 */public class Application1 {
  boolean packFrame = false;  //Construct the application
  public Application1() {
    Frame1 frame = new Frame1();
    //Validate frames that have preset sizes
    //Pack frames that have useful preferred size info, e.g. from their layout
    if (packFrame) {
      frame.pack();
    }
    else {
      frame.validate();
    }
    //Center the window
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension frameSize = frame.getSize();
    if (frameSize.height > screenSize.height) {
      frameSize.height = screenSize.height;
    }
    if (frameSize.width > screenSize.width) {
      frameSize.width = screenSize.width;
    }
    frame.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
    frame.setVisible(true);
  }
  //Main method
  public static void main(String[] args) {
    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }
    catch(Exception e) {
      e.printStackTrace();
    }
    new Application1();
  }
}