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 class AscoltatoreMouse extends MouseAdapter{
        public void mousePressed(MouseEvent e){
        JButton bottoneMagico;
            if(e.getComponent() instanceof JButton) {
        bottoneMagico = (JButton)e.getComponent();
        casellaDiCalcolo.setText(bottoneMagico.getText());
        }//if
        }//mousePressed
    }//AscoltatoreMouse