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meinTextField.setEnabled(false);
KeyListener keyListener = new KeyListener()
{
public void keyPressed(KeyEvent keyEvent)
{}
public void keyReleased(KeyEvent keyEvent)
{
int keyCode = keyEvent.getKeyCode();
String keyText = KeyEvent.getKeyText(keyCode);
if( keyText != "a" )
{
keyEvent.consume();
}
}
public void keyTyped(KeyEvent keyEvent)
{}
};
meinTextField.addKeyListener(keyListener);
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