kjjnutyufugju

 class AscoltatoreMouse extends MouseAdapter{
        public void mousePressed(MouseEvent e){
            for(int i=0;i<numeri.length;i++){
                //if(e.getComponent() instanceof JButton)
                if(e.getSource() == numeri[i])
                    casellaDiCalcolo.setText(numeri[i].getText());
                if(i<operatori.length)
                    if(e.getSource() == operatori[i])
                        casellaDiCalcolo.setText(operatori[i].getText());
            }//for
        }//mousePressed
    }//AscoltatoreMouse