Re: Double Buffering in Java 6
Jason Cavett wrote:
I just wanted to clarify. I noticed that improvements were made to
double buffering in Java 6 (true double buffering is now used) as
discussed here: http://java.sun.com/developer/technicalArticles/J2SE/Desktop/javase6/.
However, I heard someone mention that double buffering is now on by
default on all components in Java 6. Is this second statement true?
No. Although it appears that you can turn it on.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class test {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
JLayeredPane lp = new JLayeredPane();
System.out.println("JLayeredPane " +
lp.isDoubleBuffered());
JRootPane rp = new JRootPane();
System.out.println("JRootPane " + rp.isDoubleBuffered());
JPanel p = new JPanel();
System.out.println("JPanel " + p.isDoubleBuffered());
JButton b = new JButton();
System.out.println("JButton " + b.isDoubleBuffered());
JComboBox cb = new JComboBox();
System.out.println("JComboBox " + cb.isDoubleBuffered());
JLabel l = new JLabel();
System.out.println("JLabel " + l.isDoubleBuffered());
JInternalFrame f = new JInternalFrame();
System.out.println("JInternalFrame " +
f.isDoubleBuffered());
JScrollPane sp = new JScrollPane();
System.out.println("JScrollPane " + sp.isDoubleBuffered());
Box bx = new Box(0);
System.out.println("Box " + bx.isDoubleBuffered());
JTextArea ta = new JTextArea();
System.out.println("JTextArea " + ta.isDoubleBuffered());
Canvas c = new Canvas();
System.out.println("Canvas " + c.isDoubleBuffered());
b.setDoubleBuffered(true);
System.out.println("\nJButton " + b.isDoubleBuffered());
cb.setDoubleBuffered(true);
System.out.println("JComboBox " + cb.isDoubleBuffered());
sp.setDoubleBuffered(true);
System.out.println("JScrollPane " + sp.isDoubleBuffered());
ta.setDoubleBuffered(true);
System.out.println("JTextArea " + ta.isDoubleBuffered());
}
});
}
}
C:\Documents and Settings\Knute Johnson>java test
JLayeredPane false
JRootPane true
JPanel true
JButton false
JComboBox false
JLabel false
JInternalFrame false
JScrollPane false
Box false
JTextArea false
Canvas false
JButton true
JComboBox true
JScrollPane true
JTextArea true
--
Knute Johnson
email s/nospam/knute/