Cum sa construiti un TextField in Java

package sky.developer.java.mozku;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
public class JavaIntroducereText
{
   public static void main(String []args)
   {
      // Construim fereastra
      JFrame fereastra = new JFrame("Fereastra Mea");
      // Construim si adaugam un label
      JLabel eticheta = new JLabel("Introduceti textul in campul de mai jos:");
      fereastra.getContentPane().add(eticheta, BorderLayout.PAGE_START);
      // Construim si adaugam TextField-ul
      final JTextField campText = new JTextField();
      fereastra.getContentPane().add(campText, BorderLayout.CENTER);
      // Construim si adaugam butonul
      final JButton buton = new JButton("Click aici!");
      fereastra.getContentPane().add(buton, BorderLayout.PAGE_END);
      // Dam functionalitate butonului
      buton.addActionListener(new ActionListener()
      {
         public void actionPerformed(ActionEvent e)
         {
            // Aici scriem ce se intampla cand se apasa butonul
            String s = "S-a introdus: " + campText.getText();
            JOptionPane.showMessageDialog(null, s);
         }
      });
      // Ne ocupam de proprietatile ferestrei
      fereastra.pack();
      fereastra.setVisible(true);
      fereastra.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   }
}