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    <p>Maybe this example Applet will get you started.</p> <pre><code>import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.lang.reflect.InvocationTargetException; import java.net.ServerSocket; import java.net.Socket; import javax.swing.JApplet; import javax.swing.JButton; import javax.swing.JTextArea; import javax.swing.SwingUtilities; public class Example extends JApplet { private JButton _jButtonStartGameServer; private boolean _isStarted = false; private GameServer _gameServer = null; private JTextArea _jTextArea; private Thread _gameServerThread = null; private boolean _initialized = false; public Example() { System.out.println("ctor..."); } private void initComponents() { if (_initialized) { return; } _jButtonStartGameServer = new JButton("Start Game Server"); _jButtonStartGameServer.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { if (!_isStarted) { startupGameServer(); } else { shutdownGameServer(); } } }); setLayout(new BorderLayout(0, 0)); _jTextArea = new JTextArea(); add(_jTextArea); add(_jButtonStartGameServer, BorderLayout.NORTH); _initialized = true; } public void init() { System.out.println("init... " + Thread.currentThread()); try { SwingUtilities.invokeAndWait(new Runnable() { public void run() { initComponents(); } }); } catch (InvocationTargetException e) { e.printStackTrace(); } catch (InterruptedException e) { e.printStackTrace(); Thread.currentThread().interrupt(); } } public void start() { System.out.println("start... " + Thread.currentThread()); SwingUtilities.invokeLater(new Runnable() { public void run() { setSize(640/2, 480/2); } }); } public void stop() { System.out.println("stop... " + Thread.currentThread()); shutdownGameServer(); } public void destroy() { System.out.println("destroy " + Thread.currentThread()); shutdownGameServer(); } void displayException(Throwable t) { log("Got exception: " + t); } void processMessageFromOtherPlayer(String msg) { log("Received message from other player: " + msg); } void gameServerThreadExiting() { shutdownGameServer(); } public void startupGameServer() { _gameServer = new GameServer(); _gameServerThread = new Thread(_gameServer); _gameServerThread.start(); _isStarted = true; _jButtonStartGameServer.setText("Stop Game Server"); } public void shutdownGameServer() { GameServer gs = _gameServer; if (gs != null) { gs.cancel(); } Thread t = _gameServerThread; try { if (t != null) { t.join(); } } catch (InterruptedException ie) { Thread.currentThread().interrupt(); } _gameServer = null; _jButtonStartGameServer.setText("Start Game Server"); _isStarted = false; } void log(final String msg) { System.out.println("Log (" + Thread.currentThread() + "): " + msg); Runnable r = new Runnable() { public void run() { StringBuilder sb = new StringBuilder(_jTextArea.getText()); sb.append(msg); sb.append("\n"); _jTextArea.setText(sb.toString()); } }; if (SwingUtilities.isEventDispatchThread()) { r.run(); } else { SwingUtilities.invokeLater(r); } } class GameServer implements Runnable { volatile ServerSocket _ss = null; volatile Socket _s = null; volatile InputStream _sis = null; volatile boolean _cancel = false; public void run() { try { _ss = new ServerSocket(9999); log("Waiting for other player, listening on port: " + _ss.getLocalPort()); _s = _ss.accept(); log("Connection accepted from: " + _s.getRemoteSocketAddress()); _sis = _s.getInputStream(); BufferedReader br = new BufferedReader(new InputStreamReader(_sis, "UTF-8")); while (true) { if (_cancel) { break; } final String msg = br.readLine(); if (msg == null) { // connection closed / lost break; } SwingUtilities.invokeLater(new Runnable() { public void run() { processMessageFromOtherPlayer(msg); } }); } } catch (final Throwable t) { // don't show the user the exception if the user is canceling if (!_cancel) { SwingUtilities.invokeLater(new Runnable() { public void run() { displayException(t); } }); } else { // even if the user is canceling, we might be interested in the exception, though t.printStackTrace(); } } log("Game server thread exiting..."); SwingUtilities.invokeLater(new Runnable() { public void run() { gameServerThreadExiting(); } }); } public void cancel() { _cancel = true; ServerSocket ss = _ss; if (ss != null) { try { ss.close(); } catch (IOException e) { e.printStackTrace(); } } Socket s = _s; if (s != null) { try { s.close(); } catch (IOException e) { e.printStackTrace(); } } InputStream sis = _sis; if (sis != null) { try { sis.close(); } catch (IOException e) { e.printStackTrace(); } } } } } </code></pre>
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    1. POFrame freezes even if started in a other Thread
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    1. USMike Clark
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    1. COYour code should solve the freeze-problem, but the other Problem would be, that I still have to wait until the Server is connected, until I can continue with the other calculations. How should I do this? And the other thing is that I have to return a value.
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    2. COThe server is connected after the line of code `log("Connection accepted from: " + _s.getRemoteSocketAddress());`, so you could place more code there. I don't know what you mean specifically by: return a value. This is somewhat ambiguous.
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    3. COI want the program to continue where it was before. like: ... if (mode==SERVER){ info = //start the Server and send info2/receive info else if (mode==CLIENT){ info2 = //Connect to Server and send info/receive info2 } infototal=info+info2 ... "I don't know what you mean specifically by: return a value. This is somewhat ambiguous." The Server-side and Client-side both send and receive some data that is nesessary for the following calculations so I have to return the informations.
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