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Enhancement
-
Resolution: Unresolved
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P4
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None
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5.0
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x86
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windows_xp
A DESCRIPTION OF THE REQUEST :
If we add a lot of labels to a choice AWT component, it can take minutes to display de updated Choice with Windows. Under Linux, it can takes few seconds only.
JUSTIFICATION :
I don't understand this differences in performances, and I need to use AWT Components for WIndows.
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The same performances as for Linux.
ACTUAL -
When I add 20,000 labels to a Choice, it can take up to 1 minute to finish.
---------- BEGIN SOURCE ----------
The applet that demonstrate the problem:
-------------------------------------------------------
package applet;
import java.applet.Applet;
import java.awt.Button;
import java.awt.Choice;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
/**
* This program shows the time taken to update an AWT Choice with a lot of
* labels.
* <p>
* The fact is that with Microsoft Windows, it take almost 1 minute. But with
* Linux, it takes less than 1 second.
* <p>
* I am using the SUN JRE 1.6.0-b105, but with JRE 1.5.0-10, I have the same
* results.
*/
@SuppressWarnings("serial")
public class AwtProblem extends Applet {
public void init() {
/**
* A choice list
*/
final Choice listePistesChoice = new Choice() {
public Dimension getMinimumSize() {
Dimension dim = super.getMinimumSize();
dim.width = 100;
return dim;
}
public Dimension getPreferredSize() {
return getMinimumSize();
}
};
add(listePistesChoice);
/**
* A button to change the labels in the choice list
*/
Button changeListeNomsPisteButton = new Button("change labels in the choice list");
changeListeNomsPisteButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
long start = System.currentTimeMillis();
// Remove all the current content
listePistesChoice.removeAll();
// Add the new labels to the choice list
for (int i = 0; i < 20000; i++) {
listePistesChoice.add("name:" + i);
}
long end = System.currentTimeMillis();
System.out.println("Time to update:" + (end - start) + "ms");
}
});
add(changeListeNomsPisteButton);
}
}
The HTML to launch the applet:
------------------------------------------
<html>
<head>
<title>Awt problem</title>
</head>
<body>
<applet code="applet.AwtProblem"/>
</body>
</html>
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
Use a SWING JComboBox insteed of the AWT Choice.
But, everywhere, I have been told to not mix AWT and SWING components.
If we add a lot of labels to a choice AWT component, it can take minutes to display de updated Choice with Windows. Under Linux, it can takes few seconds only.
JUSTIFICATION :
I don't understand this differences in performances, and I need to use AWT Components for WIndows.
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The same performances as for Linux.
ACTUAL -
When I add 20,000 labels to a Choice, it can take up to 1 minute to finish.
---------- BEGIN SOURCE ----------
The applet that demonstrate the problem:
-------------------------------------------------------
package applet;
import java.applet.Applet;
import java.awt.Button;
import java.awt.Choice;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
/**
* This program shows the time taken to update an AWT Choice with a lot of
* labels.
* <p>
* The fact is that with Microsoft Windows, it take almost 1 minute. But with
* Linux, it takes less than 1 second.
* <p>
* I am using the SUN JRE 1.6.0-b105, but with JRE 1.5.0-10, I have the same
* results.
*/
@SuppressWarnings("serial")
public class AwtProblem extends Applet {
public void init() {
/**
* A choice list
*/
final Choice listePistesChoice = new Choice() {
public Dimension getMinimumSize() {
Dimension dim = super.getMinimumSize();
dim.width = 100;
return dim;
}
public Dimension getPreferredSize() {
return getMinimumSize();
}
};
add(listePistesChoice);
/**
* A button to change the labels in the choice list
*/
Button changeListeNomsPisteButton = new Button("change labels in the choice list");
changeListeNomsPisteButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
long start = System.currentTimeMillis();
// Remove all the current content
listePistesChoice.removeAll();
// Add the new labels to the choice list
for (int i = 0; i < 20000; i++) {
listePistesChoice.add("name:" + i);
}
long end = System.currentTimeMillis();
System.out.println("Time to update:" + (end - start) + "ms");
}
});
add(changeListeNomsPisteButton);
}
}
The HTML to launch the applet:
------------------------------------------
<html>
<head>
<title>Awt problem</title>
</head>
<body>
<applet code="applet.AwtProblem"/>
</body>
</html>
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
Use a SWING JComboBox insteed of the AWT Choice.
But, everywhere, I have been told to not mix AWT and SWING components.