How to make JPanel to transparent?

Question

Dear all, anyone here know how to make 2 JPanel to transparent and overlabbing? i try to use opaque(boolean), but i fail to do it, here is my code, i really need ur help.......thankx a lot
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Main extends JApplet
     public void init()
          DrawBase db=new DrawBase();
          DrawGraph dg=new DrawGraph();
          Container container=getContentPane();
          db.setOpaque(true);
          dg.setOpaque(true);
          container.add(db,BorderLayout.CENTER);
          container.add(dg,BorderLayout.CENTER);
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class DrawBase extends JPanel
     public DrawBase()
     public void paintComponent(Graphics g)
          super.paintComponent(g);
          g.setColor(new Color(0,255,0));
          g.drawOval(50,50,50,50);
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class DrawGraph extends JPanel
     public DrawGraph()
     public void paintComponent(Graphics g)
          super.paintComponent(g);
          g.setColor(new Color(255,0,0));
          g.drawOval(20,10,10,10);

Answer 1

Hi,
Dear all, anyone here know how to make 2 JPanel to
transparent and overlabbing? i try to use
opaque(boolean), but i fail to do it, here is my code,
i really need ur help.......thankx a lot
Well, the transparent part is easy. You should be calling setOpaque(false) rather than setOpaque(true). This will eliminate background painting of the JPanels.
The overlapping can be accomplished in multiple ways, but NOT using BorderLayout. You'll either want to do as one person suggested and use no layout manager and position things absolutely, or as another suggested and use JLayeredPane.
Personally, I would suggest a third approach that uses a single JPanel to do all of the painting. Something like this would work nicely:
public class DrawPanel extends JPanel {
    public DrawPanel() {
        setOpaque(false);
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        drawBase();
        drawGraph();
    public void drawBase() {
        g.setColor(new Color(0,255,0));
        g.drawOval(50,50,50,50);
    public void drawGraph() {
        g.setColor(new Color(255,0,0));
        g.drawOval(20,10,10,10);
}Regards,
Shannon Hickey (Swing Team)