Estou tentando criar GUI, mas não aparece nada

package exemplos;

import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.*;
import java.awt.event.*;

public class Form_layout3 extends JFrame {

        private JTextField recebe_texto;
        private JButton botao;
        private JPanel painel1;
        private JPanel painel2;
        private JPanel painel3;
        private JLabel texto;

  private void initComponents(){

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(600,600);
        setLocation(100,100);
        setTitle("Minha janela");

        texto = new JLabel();
        texto.setText("Texto Exemplo");
        texto.setVisible(true);

        recebe_texto = new JTextField();
        recebe_texto.setText("Digite seu nome");
        recebe_texto.setVisible(true);

        botao = new JButton();
        botao.setText("Botão");
        botao.setMnemonic('E');
        botao.setVisible(true);
        botao.addActionListener(new BotaoListener());

        painel1 = new JPanel();
        painel1.setVisible(true);
        painel1.setBackground(Color.BLUE);

        painel2 = new JPanel();
        painel2.setVisible(true);
        painel2.setBackground(Color.YELLOW);

        painel3 = new JPanel();
        painel3.setVisible(true);
        painel3.setBackground(Color.RED);

        painel1.add(texto);
        painel2.add(recebe_texto);
        painel3.add(botao);

        getContentPane().add(BorderLayout.NORTH, painel1);
        getContentPane().add(BorderLayout.CENTER, painel2);
        getContentPane().add(BorderLayout.SOUTH, painel3);

        setLocationRelativeTo(null); // centralizar
        setVisible(true);
  }
  public static void main(String[] args) {
    Form_layout3 janela = new Form_layout3();
    janela.setVisible(true);
    janela.pack();
    }

  class BotaoListener implements ActionListener {
    public void actionPerformed(ActionEvent e) {
        JOptionPane.showMessageDialog(null,"voce digitou: " + recebe_texto.getText() ,"Aviso",JOptionPane.INFORMATION_MESSAGE);
      }
    }


}