Here is a program that consumes KEY_TYPED events to prevent digits from being entered:


import java.awt.*;
import java.awt.event.KeyEvent;

public class Consume extends TextArea {

  public Consume(){
    enableEvents(-1);
  }

  public void processEvent(AWTEvent e){
    if(e instanceof KeyEvent){
	System.out.println(e+" getText: "+getText());
	if(e.getID()==KeyEvent.KEY_TYPED){
	  char c = ((KeyEvent)e).getKeyChar();
	  if((c>='0')&&(c<='9'))((KeyEvent)e).consume();
	}
    }
  }

  public static void main(String[] args){
    Frame f = new Frame("No Numbers");
    f.add("Center",new Consume());
    f.pack();
    f.show();
  }

}


This functions properly on Windows but not on Solaris.

Output from typing "A1" on Windows:

java.awt.event.KeyEvent[KEY_PRESSED,keyCode=16,keyChar=''] on text0 getText: 
java.awt.event.KeyEvent[KEY_PRESSED,keyCode=65,keyChar='A',modifiers=Shift] on text0 getText: 
java.awt.event.KeyEvent[KEY_TYPED,keyCode=0,keyChar='A'] on text0 getText: 
java.awt.event.KeyEvent[KEY_RELEASED,keyCode=65,keyChar='A',modifiers=Shift] on text0 getText: A
java.awt.event.KeyEvent[KEY_RELEASED,keyCode=16,keyChar='',modifiers=Shift] on text0 getText: A
java.awt.event.KeyEvent[KEY_PRESSED,keyCode=49,keyChar='1'] on text0 getText: A
java.awt.event.KeyEvent[KEY_TYPED,keyCode=0,keyChar='1'] on text0 getText: A
java.awt.event.KeyEvent[KEY_RELEASED,keyCode=49,keyChar='1'] on text0 getText: A



On Solaris - note that the text has already changed when the KEY_TYPED occurs,
thus ignoring the consume():

java.awt.event.KeyEvent[KEY_PRESSED,keyCode=16,keyChar=''] on text0 getText: 
java.awt.event.KeyEvent[KEY_PRESSED,keyCode=65,keyChar='A',modifiers=Shift] on text0 getText: 
java.awt.event.KeyEvent[KEY_TYPED,keyCode=0,keyChar='A'] on text0 getText: A
java.awt.event.KeyEvent[KEY_RELEASED,keyCode=65,keyChar='A',modifiers=Shift] on text0 getText: A
java.awt.event.KeyEvent[KEY_RELEASED,keyCode=16,keyChar='',modifiers=Shift] on text0 getText: A
java.awt.event.KeyEvent[KEY_PRESSED,keyCode=49,keyChar='1'] on text0 getText: A
java.awt.event.KeyEvent[KEY_TYPED,keyCode=0,keyChar='1'] on text0 getText: A1
java.awt.event.KeyEvent[KEY_RELEASED,keyCode=49,keyChar='1'] on text0 getText: A1