import java.awt.*;import java.awt.event.*;import java.applet.*;import javax.swing.*;import java.util.*;import java.net.*;import java.io.*;public class Client extends JApplet implements Runnable{  Socket socket=null;  DataInputStream dis=null;  DataOutputStream dos=null;  Hashtable peopleList;  Thread clientThread=null;  private boolean isStandalone = false;  ChatArea chatArea;  //Get a parameter value  /*public String getParameter(String key, String def) {    return isStandalone ? System.getProperty(key, def) :      (getParameter(key) != null ? getParameter(key) : def);  }*/  //Construct the applet  public Client() {  }  //Initialize the applet  public void init() {    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  //Component initialization  private void jbInit() throws Exception {    peopleList=new Hashtable();    chatArea=new ChatArea(peopleList);    this.setSize(new Dimension(400,300));    this.getContentPane().add(chatArea, BorderLayout.CENTER);  }  public void start(){    if(socket!=null&&dos!=null&dis!=null){      try{        socket.close();        dos.close();        dis.close();      }catch(IOException e){        e.printStackTrace();      }    }    try{      socket=new Socket(this.getCodeBase().getHost(),4331);      dos=new DataOutputStream(socket.getOutputStream());      dis=new DataInputStream(socket.getInputStream());    }catch(IOException e){      e.printStackTrace();    }    if(socket!=null){     chatArea.loginDialog.setConnection(socket,dis,dos);     System.out.println(socket.getPort()+"client");    }    if(clientThread==null){      clientThread=new Thread(this);      clientThread.start();    }  }  public void run(){    while(clientThread!=null){      if(chatArea.loginDialog.getEnableChat()){        chatArea.setConnection(socket,dos,dis);        break;      }      try{        Thread.sleep(1000);      }catch(Exception e){        //e.printStackTrace();       }    }  }  public void stop(){    try{      this.socket.close();      this.dos.flush();      this.dos.close();      this.dis.close();      this.clientThread=null;    }catch(IOException e){     // e.printStackTrace();    }  }  //Get Applet information /* public String getAppletInfo() {    return "Applet Information";  }  //Get parameter info  public String[][] getParameterInfo() {    return null;  }  //static initializer for setting look & feel  static {    try {      //UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());      //UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());    }    catch(Exception e) {    }  }*/}