The information in this article applies to:
The methods java.awt.event.KeyEvent.setKeyChar and java.awt.event.KeyEvent.consume have no effect on the AWT control when called from within the java.awt.event.KeyListener.keyTyped method.
The workaround is to move the event handling from the keyTyped method to the keyPressed method.
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.
import java.applet.*; import java.awt.*; import java.awt.event.*; public class TestKeyTyped extends Applet { TestPanel myTestPanel; public void init() { myTestPanel = new TestPanel(); add(myTestPanel); } } class TestPanel extends Panel implements KeyListener { TextArea myTextArea; TestPanel() { setLayout(new BorderLayout()); add("West", new Label("Lower case \'a\' should change to upper " + "case \'A\' and \'%\' should be consumed:")); myTextArea = new TextArea(1, 25); add("Center", myTextArea); myTextArea.addKeyListener(this); } public void keyTyped(KeyEvent e) { char ch = e.getKeyChar(); if (ch == 'a') { e.setKeyChar('A'); // Bug: Has no effect within // keyTyped } else if (ch == '%') { e.consume(); // Bug: Has no effect // within keyTyped } else { e.setKeyChar(ch); // Bug: Has no effect within // keyTyped } System.out.println("Modified event to be: "+e+ " Consumed:"+e.isConsumed()); } public void keyPressed(KeyEvent e) { // WORKAROUND // Cutting the above code from the keyTyped method // and pasting it here will cause the setKeyChar and // consume calls to work. } public void keyReleased(KeyEvent e) { } }
<applet name="TestKeyTyped" code="TestKeyTyped" width="600" height="50" align="Top"> </applet>
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KeyListener keyTyped KeyEvent TextArea setKeyChar consume