re: How do I check the text in JTextField?

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dialog.ModalityType;
import java.awt.Dimension;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.*;

/**
 * In reference to: How do I check the text in JTextField?
 * http://stackoverflow.com/questions/26044389/how-do-i-check-the-text-in-jtextfield
 * @author Pete
 *
 */
public class SubmitPanelTest {
   private static void createAndShowGui() {
      final SubmitPanel submitPanel = new SubmitPanel();
      final SubmitExampleMainPanel mainPanel = new SubmitExampleMainPanel(
            submitPanel);

      JFrame frame = new JFrame("Command");
      frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
      frame.getContentPane().add(mainPanel);
      frame.pack();
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);

      JDialog dialog = new JDialog(frame, "Submit Command",
            ModalityType.MODELESS);
      dialog.getContentPane().add(submitPanel);
      dialog.pack();
      dialog.setLocationRelativeTo(frame);
      Point p = frame.getLocation();
      int locX = p.x + 50;
      int locY = p.y + 150;
      dialog.setLocation(locX, locY);
      dialog.setVisible(true);

      submitPanel.addPropertyChangeListener(new PropertyChangeListener() {

         @Override
         public void propertyChange(PropertyChangeEvent evt) {
            if (SubmitPanel.SUBMIT.equals(evt.getPropertyName())) {
               Object submit = evt.getNewValue();
               if (submit == null) {
                  return;
               }
               System.out.println("Submit String = " + submit);
            }
         }
      });
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}

@SuppressWarnings("serial")
class SubmitExampleMainPanel extends JPanel {
   private StatusBarPanel statusbar = new StatusBarPanel();

   public SubmitExampleMainPanel(SubmitPanel submitPanel) {
      JPanel southPanel = new JPanel();
      southPanel.setLayout(new BoxLayout(southPanel, BoxLayout.LINE_AXIS));
      southPanel.add(statusbar);
      southPanel.add(new JButton(new ExitAction("Exit", KeyEvent.VK_X)));

      setLayout(new BorderLayout());
      add(southPanel, BorderLayout.PAGE_END);
      add(Box.createRigidArea(new Dimension(400, 300)));

      submitPanel.addPropertyChangeListener(SubmitPanel.SUBMIT,
            new SubmitListener());
   }

   private class SubmitListener implements PropertyChangeListener {
      @Override
      public void propertyChange(PropertyChangeEvent pcEvt) {
         Object newValue = pcEvt.getNewValue();
         if (newValue != null) {
            String command = newValue.toString();
            statusbar.setCommandText(command);
         }
      }
   }
}

@SuppressWarnings("serial")
class StatusBarPanel extends JPanel {
   private static final int COLUMNS = 20;
   private JTextField commandField = new JTextField(COLUMNS);

   public StatusBarPanel() {
      commandField.setEditable(false);
      commandField.setFocusable(false);
      add(new JLabel("Current Command:"));
      add(commandField);
   }

   public void setCommandText(String commandText) {
      commandField.setText(commandText);
   }
}

@SuppressWarnings("serial")
class SubmitPanel extends JPanel {
   public static final String SUBMIT = "submit";
   private static final int COLUMNS = 40;
   private String submit = "";
   private JTextField submitField = new JTextField(COLUMNS);

   public SubmitPanel() {
      SubmitAction submitAction = new SubmitAction("Submit", KeyEvent.VK_S);
      submitField.addActionListener(submitAction);
      add(submitField);
      add(new JButton(submitAction));
      add(new JButton(new ExitAction("Exit", KeyEvent.VK_X)));
   }

   private class SubmitAction extends AbstractAction {
      public SubmitAction(String name, int mnemonic) {
         super(name);
         putValue(MNEMONIC_KEY, mnemonic);
      }

      @Override
      public void actionPerformed(ActionEvent e) {
         setSubmit(submitField.getText());
         submitField.selectAll();
         submitField.requestFocusInWindow();
      }
   }

   public String getSubmit() {
      return submit;
   }

   public void setSubmit(String submit) {
      String oldValue = this.submit;
      String newValue = submit;
      this.submit = newValue;
      firePropertyChange(SUBMIT, oldValue, newValue);
   }
}

@SuppressWarnings("serial")
class ExitAction extends AbstractAction {
   public ExitAction(String name, int mnemonic) {
      super(name);
      putValue(MNEMONIC_KEY, mnemonic);
   }

   @Override
   public void actionPerformed(ActionEvent e) {
      Component comp = (Component) e.getSource();
      java.awt.Window win = SwingUtilities.getWindowAncestor(comp);
      win.dispose();
   }
}