Swing modal dialog refuses to close - sometimes!
- by Zarkonnen
// This is supposed to show a modal dialog and then hide it again. In practice,
// this works about 75% of the time, and the other 25% of the time, the dialog
// stays visible.
// This is on Ubuntu 10.10, running:
// OpenJDK Runtime Environment (IcedTea6 1.9) (6b20-1.9-0ubuntu1)
// This always prints
// setVisible(true) about to happen
// setVisible(false) about to happen
// setVisible(false) has just happened
// even when the dialog stays visible.
package modalproblemdemo;
import java.awt.Frame;
import javax.swing.JDialog;
import javax.swing.SwingUtilities;
public class Main {
public static void main(String[] args) {
final Dialogs d = new Dialogs();
new Thread() {
@Override
public void run() {
d.show();
d.hide();
}
}.start();
}
static class Dialogs {
final JDialog dialog;
public Dialogs() {
dialog = new JDialog((Frame) null, "Hello World", /*modal*/ true);
dialog.setSize(400, 200);
}
public void show() {
SwingUtilities.invokeLater(new Runnable() { public void run() {
dialog.setLocationRelativeTo(null);
System.out.println("setVisible(true) about to happen");
dialog.setVisible(true);
}});
}
public void hide() {
SwingUtilities.invokeLater(new Runnable() { public void run() {
System.out.println("setVisible(false) about to happen");
dialog.setVisible(false);
System.out.println("setVisible(false) has just happened");
}});
}
}
}
