Make JTextField not editable in Java

/* w  w  w  .j a  va 2  s. c o m*/
import java.awt.FlowLayout;

import javax.swing.JFrame;
import javax.swing.JTextField;

public class Main {
  public static void main(String[] args) {
    JFrame f = new JFrame("Editability Example");

    String firstFieldText = "An editable text field";
    JTextField firstField = new JTextField(firstFieldText, 20);

    f.setLayout(new FlowLayout());
    f.getContentPane().add(firstField);

    firstField.setEditable(false);

    f.pack();
    f.setVisible(true);

  }

}