Java Swing - KeyListener -

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How do I know that when the key is typed, my text changes? Or if the key is a four?

Three ways in the interface KeyListener :

zero Type Key (KeyEvent)
Zero Key Pressed (Key Event)
Zero Key Relayed (Key Event)

So, if you like KeyEvent object: 

  if ("a" .equals (KeyEvent.getKeyChar ()) is System.out.println ("this is a letter")

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