Adicionar evento

campo.addKeyListener(new KeyAdapter() {
   public void keyPressed(KeyEvent evt) {
				
	// Se for apertado o botao 9 do teclado
	if (evt.getKeyCode() == KeyEvent.VK_F9) {
						
        }
   }
});

campo.addMouseListener(
      new MouseAdapter(){
        public void mouseClicked(MouseEvent e){
           
        }
      }
    );

botao.addActionListener(
      new ActionListener(){
        public void actionPerformed(ActionEvent e){
          JOptionPane.showMessageDialog(null, "Fui clicado");
        }
      }
    );