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

class MyGUIApp extends JFrame {

    // Use fields for GUI components that need to be referenced outside of the GUI initialization process (initGUI)

    /**
     * Constructor for the GUI.
     */
    public MyGUIApp() {
        // initialize fields here.  Surrounding your code in a protective try-catch is recommended.

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Causes the application to end if the GUI frame is closed.
        initGUI();  // initialize the GUI components
    }

    /**
     * Actually start the GUI
     */
    public void start() {
       // Do any last second initializations, if needed.
       setVisible(true);  // Make the GUI visible
    }

    /**
     * Initialize the GUI components
     */
    private void initGUI() {
        Container contentPane = getContentPane(); // all GUI components are added to the frame's ContentPane.
                                                  // You can also just call the accessor each time as well and not use a local variable.

        // instantiate, initialize and connect all the GUI's components here.
        // Don't forget to add them to the container that holds them, e.g. the ContentPane.

    }

    /**
     * Main method that starts the app.
     * In general, this would not be in this class but rather in a separate "controller" class
     * with slightly different coding (as required for a true Model-View-Controller system).
     * We put it here for now, for simplicity's sake only.
     */
    public static void main(String[] args) {
        // initialize and start the GUI on the GUI thread.
        SwingUtilities.invokeLater(new Runnable() {
	   public void run() {
              MyGUIApp view = new MyGUIApp();  // instantiate the GUI but don't show it yet.
              // Model classes would be instantiated here plus any other required objects.
              view.start();  // Start the application by making the GUI visible.
           }
        });
    }
}

JButton runBtn = new JButton("Run!");
runBtn.addActionListener(new ActionListener() {

      /**
       * This method runs when the button is clicked.
       */
      public void actionPerformed(ActionEvent evt) {
           // Do stuff here.  Generally, delegate to a non-GUI object (the "model").
      }
   });
contolPnlcontrolPnl.add(runBtn);

 JLabel infoLbl = new JLabel();

 infoLbl.setText("Enter text here:");
 controlPnl.add(infoLbl);

final JTextField infoTF = new TextFieldJTextField("default text");  // don't need "final" below if this line was defining a field instead of a local variable.
infoTF.setPreferredSize(new java.awt.Dimension(75, 23)); // set default text field size to 75x23 pixels.
infoTF.addActionListener(new ActionListener() {

      /**
       * This method runs when "Enter" is pressed after entering text into the text field.
       */
      public void actionPerformed(ActionEvent evt) {
           String text = infoTF.getText();  // the text of the text field.
           // Do stuff here. Generally, delegate to a non-GUI object (the "model").

      }
   });

controlPnl.add(infoTF);