Appropriate or Inappropriate use of JDialog?

Hi! I'm simply trying to get some text from a JDialog as input by a user. I would like to show my code and have someone tell me if it is appropriate or not. It does work, but I want to be sure I'm doing it correctly.
Here's the code:
public class InputBox extends JDialog {
     private     JTextField mText;
     public InputBox() {
          super();
          this.setSize(260,140);
          addWidgets();
          this.setLocation(200,200);
          this.setModal(true);
     private void addWidgets() {
          SpringLayout pLyt = new SpringLayout();
          JPanel panel = new JPanel(pLyt);
          JLabel lbl = new JLabel("Enter formula...");
          mText = new JTextField(20);
          JButton ok = new JButton(" OK ");
          JButton cancel = new JButton("Cancel");
          ok.setSize(50,100);
          panel.add(lbl);
          panel.add(mText);
          panel.add(ok);
          panel.add(cancel);
          pLyt.putConstraint(SpringLayout.NORTH, lbl, 10, SpringLayout.NORTH, panel);
          pLyt.putConstraint(SpringLayout.WEST, lbl, 15, SpringLayout.WEST, panel);
          pLyt.putConstraint(SpringLayout.NORTH, mText, 5, SpringLayout.SOUTH, lbl);
          pLyt.putConstraint(SpringLayout.WEST, mText, 15, SpringLayout.WEST, panel);
          pLyt.putConstraint(SpringLayout.WEST, ok, 50, SpringLayout.WEST, panel);
          pLyt.putConstraint(SpringLayout.NORTH, ok, 15, SpringLayout.SOUTH, mText);
          pLyt.putConstraint(SpringLayout.NORTH, cancel, 15, SpringLayout.SOUTH, mText);
          pLyt.putConstraint(SpringLayout.WEST, cancel, 15, SpringLayout.EAST, ok);
          this.getContentPane().add(panel);
          cancel.addActionListener(new ActionListener() {
                         public void actionPerformed(ActionEvent args) {
                              this.setVisible(false);
          ok.addActionListener(new ActionListener() {
                         public void actionPerformed(ActionEvent args) {
                              this.setVisible(false);
     public String showDialog() {
          this.setVisible(true);
          return mText.getText();
Also,
how do I display code on this forum so it is displayed nicely?
THanks for any help!

JOptionPane.showMessageDialog(null,"<html>The important thing is that whatever<br> you do teaches you something new</html>");

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