efeeff

public void actionPerformed(ActionEvent acao) {

	if(acao.getSource() == subt) {


                            double num1 = Double.parseDouble(caixa1.getText());
                            double num2 = Double.parseDouble(caixa2.getText());
                            double result = num1 - num2;
                              resul.setText(""+result);
                    }
}