New calculadora - Swing

    import javax.swing.*;

import java.awt.*;
import java.awt.event.*;

    public class MultiplicaSenhor extends JFrame implements ActionListener{

        JButton limpar = new JButton("Limpar");
        JButton calcular = new JButton("Calcular");
        JButton soma = new JButton("+");
        JButton subt = new JButton("-");
        JButton mult = new JButton("*");
        JButton divi = new JButton("/");

        JTextField login = new JTextField();
        JTextField senha = new JTextField();
        JTextField resul = new JTextField();



        public MultiplicaSenhor() {

            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            setSize(500,400);
            setTitle("Ela que me diz..");                                           // PROPRIEDADES DA JANELA
            setResizable(false);
            getContentPane().setLayout(null);




           soma.setBounds(70, 195, 50, 20);
           getContentPane().add(soma);
           soma.addActionListener(new Soma());

           subt.setBounds(130, 195, 50, 20);
           getContentPane().add(subt);
          // subt.addActionListener(new Sub());
                                                                                    //OPERADORES
           mult.setBounds(190, 195, 50, 20);
           getContentPane().add(mult);
           mult.addActionListener(this);

           divi.setBounds(250, 195, 50, 20);
           getContentPane().add(divi);
           divi.addActionListener(this);





           login.setBounds(120, 145, 140, 20);
           getContentPane().add(login);

           senha.setBounds(120, 170, 140, 20);
           getContentPane().add(senha);                                             //CAIXAS DE TEXTO

           resul.setBounds(120, 220, 140, 20);
           getContentPane().add(resul);




           calcular.setBounds(135, 320, 100, 20);
           getContentPane().add(calcular);
           calcular.addActionListener(new Somou());
           calcular.setEnabled(false);
                                                                                    //BOTÕES
           limpar.setBounds(135, 350, 100, 20);
           getContentPane().add(limpar);
           limpar.addActionListener(this);

        }


        public static void main(String[] args) {

             MultiplicaSenhor janela = new MultiplicaSenhor();
            janela.setVisible(true);
            janela.show();

        }

        //public void actionPerformed(ActionEvent acao) {
        //soma() {


        class Soma implements ActionListener{


                public void actionPerformed(ActionEvent ev) {

                    calcular.setEnabled(true);
                }
        }
                        class Somou implements ActionListener {

                            public void actionPerformed(ActionEvent ac) {



                                 double num1 = Double.parseDouble(login.getText());
                                  double num2 = Double.parseDouble(senha.getText());
                                  double result = num1 + num2;
                                  resul.setText(""+result);
                                }
                            }




                 }