title: Swing problem!(problem in showing a frame)
body: <p>sorry for posting a lot of code!!I don't know that why my ListFrame doesn't work???
  these are the classes.At first I run the MainServer and then I will run the MainFrame in the other package.and then by inserting a correct user name and password ,the Listframe will be shown,BUT I click on menu bar or list or delete button but nothing will happen.why?? please help me.</p>
  
  <p>MainSerevr class :</p>
  
  <pre><code>public class MainServer {
  
  static Socket client = null;
  static ServerSocket server = null;
  
  public static void main(String[] args) {
      System.out.println("Server is starting...");
      System.out.println("Server is listening...");
  
      try {
          server = new ServerSocket(5050);
      } catch (IOException ex) {
          System.out.println("Could not listen on port 5050");
          System.exit(-1);
  
      }
      try {
          client = server.accept();
          System.out.println("Client Connected...");
      } catch (IOException e) {
          System.out.println("Accept failed: 5050");
          System.exit(-1);
      }
      try {
          BufferedReader streamIn = new BufferedReader(new InputStreamReader(client.getInputStream()));
  
          boolean done = false;
          String line;
          while (!done) {
              line = streamIn.readLine();
              if (line.equalsIgnoreCase(".bye")) {
                  done = true;
              } else {
                  System.out.println("Client says: " + line);
              }
          }
  
          streamIn.close();
          client.close();
          server.close();
      } catch (IOException e) {
          System.out.println("IO Error in streams " + e);
      }
  }}
  </code></pre>
  
  <p>ListFrame:</p>
  
  <pre><code> public class ListFrame extends javax.swing.JFrame implements PersonsModelChangeListener {
  
      private InformationClass client;
      private static DefaultListModel model = new DefaultListModel();
      private ListSelectionModel moDel;
  
      /** Creates new form ListFrame */
      public ListFrame(InformationClass client) {
          initComponents();
          this.client = client;
          jList1.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
  
  
          fillTable();
          Manager.addListener(this);
      }
  
      private void deleteAPerson() {
          int index = jList1.getSelectedIndex();
          String yahooId = (String) jList1.getSelectedValue();
          model.remove(index);
          Manager.removeApersonFromSQL(yahooId);
          int size = model.getSize();
          if (size == 0) {
              jButton1.setEnabled(false);
          } else {
              if (index == size) {
                  index--;
              }
              jList1.setSelectedIndex(index);
              jList1.ensureIndexIsVisible(index);
  
          }
      }                       
  
  
  
    private void jMenuItem2ActionPerformed(java.awt.event.ActionEvent evt) {                                           
          AddAPerson frame = new AddAPerson(client);
          frame.setVisible(true);
  
  
      }                                          
  
      private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
          deleteAPerson();
      }                                        
  
      private void jList1ValueChanged(javax.swing.event.ListSelectionEvent evt) {                                    
          MainClient.setText("");
          MainClient.runAClient();
          ChatFrame frame = new ChatFrame(client);
          frame.setVisible(true);
      }  
      public void fillTable() {
      try {
          List&lt;InformationClass&gt; list = null;
          list = Manager.getClientListFromMySQL();
          if (list == null) {
  
              JOptionPane.showMessageDialog(this, "You should add a person to your list", "Information", JOptionPane.OK_OPTION);
              return;
          } else {
  
  
              for (int i = 0; i &lt; list.size(); i++) {
                  InformationClass list1 = list.get(i);
                  model.add(i, list1.getId());
              }
  
              jList1.setModel(model);
          }
  
  
      } catch (SQLException ex) {
          Logger.getLogger(ListFrame.class.getName()).log(Level.SEVERE, null, ex);
      }
  }
  </code></pre>
  
  <p>MainClient class:</p>
  
  <pre><code>public class MainClient {
  
  
  private static InformationClass info = new InformationClass();
  private static Socket c;
  private static String text;
  
  public static String getText() {
      return text;
  }
  
  public static void setText(String text) {
      MainClient.text = text;
  }
  
  private static PrintWriter os;
  private static BufferedReader is;
  static boolean closed = false;
  
  /**
   * @param args the command line arguments
   */
  public static void runAClient() {
      try {
          c = new Socket("localhost", 5050);
  
          os = new PrintWriter(c.getOutputStream());
          is = new BufferedReader(new InputStreamReader(c.getInputStream()));
  
          String teXt = getText();
          os.println(teXt);
          if(c!=null&amp;&amp; is!=null&amp;&amp;os!=null){
          String line = is.readLine();
          System.out.println("Text received: " + line);
          }
  
  
          c.close();
          is.close();
          os.close();
  
  
      } catch (UnknownHostException ex) {
          System.err.println("Don't know about host");
  
      } catch (Exception e) {
          System.err.println("IOException:  " + e);
  
      }
  
  }
  
  
  }
  </code></pre>
  
  <p>EDIT:I have found the problem,which is because of writting MainClient.runAClient() in code ,where should I put it? please help me.</p>