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| 1.4.2_04 04Fixed |
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Name: jk109818 Date: 09/10/2002
FULL PRODUCT VERSION :
java version "1.4.0_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0_01-b03)
Java HotSpot(TM) Client VM (build 1.4.0_01-b03, mixed mode)
java version "1.4.1-rc"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-rc-b19)
Java HotSpot(TM) Client VM (build 1.4.1-rc-b19, mixed mode)
FULL OPERATING SYSTEM VERSION :
all Windows OS
A DESCRIPTION OF THE PROBLEM :
a call to java.awt.Container.add can be very slow (about 3
seconds or even more) in Applets!
REGRESSION. Last worked in version 1.3.1
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. compile source code
2. start html-file with the appletviewer
3. click on the "two" button
(the center panel will become blue)
4. click on the "one" button
it tooks about 3 seconds to switch the panel
(see output to console)
EXPECTED VERSUS ACTUAL BEHAVIOR :
switch of the panels should simply be faster
REPRODUCIBILITY :
This bug can be reproduced always.
---------- BEGIN SOURCE ----------
/*
* Java14test.java 1.0 02/09/10
*/
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class Java14test extends Applet implements ActionListener
{
Panel p1 = new Panel();
Panel p2 = new Panel();
Panel p3 = new Panel();
Button b1 = new Button("one");
Button b2 = new Button("two");
public void init()
{
setLayout(new BorderLayout());
p1.setLayout(new BorderLayout());
p1.add(BorderLayout.WEST, b1);
p1.add(BorderLayout.EAST, b2);
p2.setLayout(null);
p3.setLayout(null);
p2.setBackground(Color.yellow);
p3.setBackground(Color.blue);
p1.add(BorderLayout.CENTER, p2);
add(BorderLayout.CENTER, p1);
b1.addActionListener(this);
b2.addActionListener(this);
}
public void actionPerformed(ActionEvent ae)
{
Object obj = ae.getSource();
if (obj == b1)
{
long time1 = System.currentTimeMillis();
p1.removeAll();
long time2 = System.currentTimeMillis();
p1.add(BorderLayout.WEST, b1);
long time3 = System.currentTimeMillis();
p1.add(BorderLayout.EAST, b2);
long time4 = System.currentTimeMillis();
p1.add(BorderLayout.CENTER, p2);
long time5 = System.currentTimeMillis();
invalidate();
long time6 = System.currentTimeMillis();
p2.repaint();
long time7 = System.currentTimeMillis();
validate();
long time8 = System.currentTimeMillis();
System.out.println("<<<<< Change-Status:");
System.out.println("removeAll: " + (time2-time1)+"ms");
System.out.println("add button1: " + (time3-time2)+"ms");
System.out.println("add button2: " + (time4-time3)+"ms");
System.out.println("add Panel 1: " + (time5-time4)+"ms");
System.out.println("showing : " + (time8-time5)+"ms");
System.out.println("all : " + (time8-time1)+"ms");
}
else if (obj == b2)
{
long time1 = System.currentTimeMillis();
p1.removeAll();
long time2 = System.currentTimeMillis();
p1.add(BorderLayout.WEST, b1);
long time3 = System.currentTimeMillis();
p1.add(BorderLayout.EAST, b2);
long time4 = System.currentTimeMillis();
p1.add(BorderLayout.CENTER, p3);
long time5 = System.currentTimeMillis();
invalidate();
long time6 = System.currentTimeMillis();
p3.repaint();
long time7 = System.currentTimeMillis();
validate();
long time8 = System.currentTimeMillis();
System.out.println("<<<<< Change-Status:");
System.out.println("removeAll: " + (time2-time1)+"ms");
System.out.println("add button1: " + (time3-time2)+"ms");
System.out.println("add button2: " + (time4-time3)+"ms");
System.out.println("add Panel 2: " + (time5-time4)+"ms");
System.out.println("showing : " + (time8-time5)+"ms");
System.out.println("all : " + (time8-time1)+"ms");
}
}
}
<html>
<applet code=Java14test.class
height=150 width=200>
</applet>
</html>
---------- END SOURCE ----------
CUSTOMER WORKAROUND :
use CardLayout instead of removing old panel
and adding new one
Release Regression From : 1.3.1_04
The above release value was the last known release where this
bug was known to work. Since then there has been a regression.
(Review ID: 164280)
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