Re: basic GUI question

jrobinss wrote:


I haven't read your SSCCE yet, but I thought I'd show you my solution. I
notice you have one extra niggle that was mentioned earlier (the
property change listener).

package serverwithgui;

import java.awt.Label;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

/**
  *
  * @author Brenden
  */
public class ServerWithGui {

     public static void main(String[] args) throws Exception
     {
         BufferedReader input = new BufferedReader( new InputStreamReader(
                 System.in ) );
         for(;;) {
             System.out.print(" cmd> ");
             System.out.flush();
             String s = input.readLine();
             if (s != null) {
                 if ("start".equals(s)) {
                     Gui.start();
                 } else if ("stop".equals(s)) {
                     Gui.stop();
                 } else {
                     System.err.println("Didn't recognize: " + s);
                 }
             } else { // s == null
                 break; // exit for(;;) loop
             }
         } // for(;;)
     }

}

class Gui {

     // Utility class: "start()" and "stop()"

     private Gui() {} // non-instantiable, use start and stop methods

     private static JFrame jf;

     public static void start()
     {
         startGuiOnEdt();
     }

     public static void stop()
     {
         stopGuiOnEdt();

     }

     private static void startGuiOnEdt()
     {
         SwingUtilities.invokeLater( new Runnable() {

             public void run()
             {
                 createAndShowGui();
             }
         } );
     }

     private static void createAndShowGui() {
         jf = new JFrame( "Please answer the question.");
         JPanel p = new JPanel();
         p.add( new Label( "What is your quest?"));

         final JTextField f = new JTextField( 20 );
         f.addActionListener( new ActionListener() {

             public void actionPerformed(ActionEvent e)
             {
                 System.out.println( f.getText() );
                 f.setText( "" );
             }
         } );

         p.add( f );
         jf.add( p );

         jf.pack();
         jf.setLocationRelativeTo( null );
         jf.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
         jf.setVisible( true );
     }

     private static void stopGuiOnEdt()
     {
         SwingUtilities.invokeLater( new Runnable() {

             public void run()
             {
                 stopGui();
             }
         } );
     }

     private static void stopGui()
     {
         jf.setVisible( false );
         jf.dispose();
         jf = null;
     }
}