/*
* Copyright ( c ) 2019 , Oracle and / or its affiliates . All rights reserved .
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER .
*
* This code is free software ; you can redistribute it and / or modify it
* under the terms of the GNU General Public License version 2 only , as
* published by the Free Software Foundation .
*
* This code is distributed in the hope that it will be useful , but WITHOUT
* ANY WARRANTY ; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE . See the GNU General Public License
* version 2 for more details ( a copy is included in the LICENSE file that
* accompanied this code ) .
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work ; if not , write to the Free Software Foundation ,
* Inc . , 51 Franklin St , Fifth Floor , Boston , MA 02110 - 1301 USA .
*
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*/
/*
* @ test
* @ key headful
* @ requires ( os . family ! = " mac " )
* @ bug 8218917
* @ summary Tests whether sending an ALT_GRAPH key once , will result in the
* system reporting only ALT_GRAPH even if an ALT was sent and vice versa .
* @ run main AltKeyBug
*/
import javax.swing.JTextField;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import java.awt.Robot;
import java.awt.event.KeyListener;
import java.awt.event.KeyEvent;
public class AltKeyBug {
private static JFrame f;
private static boolean rightAltPressed = false ;
private static boolean throwException = false ;
private static String errorString;
public static void main(String[] args) throws Exception {
try {
Robot robot = new Robot();
robot.setAutoDelay(50 );
SwingUtilities.invokeAndWait(() -> {
JTextField comp = new JTextField();
comp.addKeyListener(new KeyListener() {
@Override public void keyTyped(KeyEvent e) {}
@Override public void keyPressed(KeyEvent e) {
System.out.println("ModEx : " +e.getModifiersEx());
System.out.println("Mod : " +e.getModifiers());
System.out.println("ALT_DOWN : " + e.isAltDown());
System.out.println("ALT_GR_DOWN: " + e.isAltGraphDown());
System.out.println("-----------" );
if (rightAltPressed && !e.isAltGraphDown()) {
throwException = true ;
errorString = "Right Alt press was sent but not received back." ;
} else if (!rightAltPressed && e.isAltGraphDown()) {
throwException = true ;
errorString = "Left Alt press was sent, but received Right Alt" ;
}
}
@Override public void keyReleased(KeyEvent e) {}
});
f = new JFrame();
f.add(comp);
f.setSize(100 ,100 );
f.setVisible(true );
});
for (int i = 0 ; i < 20 ; i++) {
rightAltPressed = true ;
robot.keyPress(KeyEvent.VK_ALT_GRAPH);
robot.keyRelease(KeyEvent.VK_ALT_GRAPH);
robot.waitForIdle();
if (throwException) {
throw new RuntimeException(errorString);
}
rightAltPressed = false ;
robot.keyPress(KeyEvent.VK_ALT);
robot.keyRelease(KeyEvent.VK_ALT);
robot.waitForIdle();
if (throwException) {
throw new RuntimeException(errorString);
}
}
} finally {
SwingUtilities.invokeAndWait(()-> {
if (f != null )
f.dispose();
});
}
System.out.println("Test passed." );
}
}
Messung V0.5 in Prozent C=99 H=93 G=95
¤ Dauer der Verarbeitung: 0.11 Sekunden
(vorverarbeitet am 2026-06-10)
¤
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