Original blub code should look like that: frame.addKeyListener(new KeyListener() { public void keyTyped(KeyEvent event) { switch (event.getKeyChar()) { case 'j': drop(); break; case 'h': move(-1); break; case 'k': move(1); break; case 'u': rotate(); break; } }

      public void keyPressed(KeyEvent event) {
      }

      public void keyReleased(KeyEvent event) {
      }
    });

About Arc code:

    (on-key-press frame
      'u     (rotate-shape)
      'j     (drop-shape)
      'h     (move-shape -1)
      'k     (move-shape 1))

Is this code ADDS NEW key event handler OR OVERRIDES old one? When it is invoked - when key is PRESSED or when key is TYPED?