CODEWITHSUNDEEP
javajava-8keyboard
Alan.Soares
Alan.Soares

Reputation: 61

JDK-8 - java.awt.event.KeyEvent.getKeyChar() not work

With the code below we have two behaviors, typing Til(~) character key.
On jdk 1.8.0_101 are printed character => Til(~)
On Jdk 1.8.0_171 are printed => Undefined(￿) character.
I search on google and oracle documentation, but not found nothing about this.
Apparently it's something recent. Any Ideia?

public class Sample extends JFrame {

private javax.swing.JTextField jTextField1;

public Sample() {
    setSize(200, 80);
    setLocationRelativeTo(null);
    jTextField1 = new javax.swing.JTextField();
    jTextField1.addKeyListener(new java.awt.event.KeyAdapter() {
        public void keyReleased(java.awt.event.KeyEvent evt) {
            System.out.println(evt.getKeyChar());
        }
    });
    add(jTextField1);
}

public static void main(String[] args) {
    new Sample().setVisible(true);
}}

Jdk 1.8.0_171 Jdk 1.8.0_101

Upvotes: 0

Views: 1505

Answers (2)

Alan.Soares
Alan.Soares

Reputation: 61

Using the keyTyped did not work because getKeyChar() also returned me Undefined char. So I do a workaround below on KeyPress.

public void keyPressed(KeyEvent evt) {
    if (JAVA_8 && evt.getKeyChar() == KeyEvent.CHAR_UNDEFINED) {
        callKeyPressedEvent: {
            switch (evt.getKeyCode()) {
                case 129:
                    evt.setKeyChar(((evt.getModifiers() & KeyEvent.SHIFT_MASK) == 1) ? '\u0060' : '\u00b4');//` and ´
                    break;
                case 131:
                    evt.setKeyChar(((evt.getModifiers() & KeyEvent.SHIFT_MASK) == 1) ? '\u005E' : '\u007E');//^ and ~
                    break;
                case 135:
                    if ((evt.getModifiers() & KeyEvent.SHIFT_MASK) == 1) {
                        evt.setKeyChar('\u00a8');//¨
                        break;
                    }
                default:
                    break callKeyPressedEvent;
            }

            processKeyEvent(evt);
        }
}

Upvotes: 0

mark42inbound
mark42inbound

Reputation: 374

According to the documentation of getKeyChar() method,

Returns the character associated with the key in this event. For example, the KEY_TYPED event for shift + "a" returns the value for "A". KEY_PRESSED and KEY_RELEASED events are not intended for reporting of character input. Therefore, the values returned by this method are guaranteed to be meaningful only for KEY_TYPED events.

So if you simply want to report the character typed, you should use the keyTyped() instead of keyReleased(). It worked for me. Here's the code for keyTyped() method:

@Override
public void keyTyped(java.awt.event.KeyEvent evt){
    System.out.println(evt.getKeyChar());
}

Upvotes: 1

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