关于线程通信的,不知为什么错了?请大侠指点迷津~!

Question

--------------------------------------------------------------------------------
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
import java.io.*;
import java.util.*;
import java.util.*;
public class Client extends JFrame implements ActionListener
{
JPanel panelBack, panelTalk;
JTextArea textViewTalk;
JLabel labelTalk, labelTo;
JTextField textTalk, textName;
JButton buttonTalk;
JComboBox listOnline;
GridBagLayout g1;
BorderLayout bd1;
GridBagConstraints gbc;

Socket socket;
BufferedReader in;
PrintWriter out;
String strSend, strReceive, strKey, strStatus;
private StringTokenizer st;

public Client()
{
g1 = new GridBagLayout();
bd1 = new BorderLayout();
gbc = new GridBagConstraints();
panelBack = (JPanel)getContentPane();
panelBack.setLayout(bd1);

buttonTalk = new JButton("Send");

labelTalk = new JLabel("Talk: ");
labelTo = new JLabel("To: ");
textTalk = new JTextField(30);
panelTalk = new JPanel();
textViewTalk = new JTextArea(18,40);
listOnline = new JComboBox();

buttonTalk.addActionListener(this);

listOnline.addItem("All");

panelTalk.add(labelTalk);
panelTalk.add(textTalk);
panelTalk.add(labelTo);
panelTalk.add(listOnline);
panelTalk.add(buttonTalk);

panelBack.add("Center",textViewTalk);
panelBack.add("South",panelTalk);
buttonTalk.setEnabled(false);
setSize(600,450);
show();

}
public static void main(String[] args)
{
new Client();
}

void connectServer()
{
try
{
socket = new Socket("192.168.1.3",8049);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())),true);
} catch(Exception e)
{
System.out.println(e);
}
}
private void initLogin() throws IOException
{
strReceive = in.readLine();
        st = new StringTokenizer(strReceive,"|");
        strStatus = st.nextToken();
        if(strStatus.equals("succeed"))
        {
          buttonTalk.setEnabled(true);
          new ClientThread(socket);
         out.println("init|online");
        }
}
 
   public void actionPerformed(ActionEvent evt)
   {
Object obj=evt.getSource();            
        try
        {
  connectServer();
out.println(strSend);
initLogin();
      
if(obj==buttonTalk)
{
      if(textTalk.getText().length()>0)
     {
     out.println("talk|"+textTalk.getText()+"|"+textName.getText()+"|"+listOnline.getSelectedItem().toString());
     textTalk.setText("");
     }
    }
 }
 catch(Exception e)
 {
System.out.println(e);
 }
}
class ClientThread implements Runnable
{
private Socket socket;
private BufferedReader in;
private PrintWriter out;
private String strReceive;
private String strKey;
private Thread threadTalk;
private StringTokenizer st;

public ClientThread(Socket s)throws IOException
{
this.socket = s;
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
threadTalk = new Thread(this);
threadTalk.start();
}

public void run()
{
while(true)
{
synchronized(this)
{
try
{
strReceive = in.readLine();
st = new StringTokenizer(strReceive,"|");
strKey = st.nextToken();
if(strKey.equals("talk"))
{
String strTalk = st.nextToken();
strTalk = textViewTalk.getText()+"\r\n "+strTalk;
textViewTalk.setText(strTalk);
}
else if(strKey.equals("online"))
{
String strOnline;
while(st.hasMoreTokens())
{
strOnline = st.nextToken();
listOnline.addItem(strOnline);
}
}
else if(strKey.equals("remove"))
{
String strRemove;
while(st.hasMoreTokens())
{
strRemove = st.nextToken();
listOnline.removeItem(strRemove);
}
}
Thread.sleep(1000);
}
catch(Exception e){}
}
}
}
}
}
--------------------------------------------------------------------------------
编译时:有错,错误如下:
--------------------Configuration: j2sdk1.5.0 <Default>--------------------
D:\JCreator Pro\MyProjects\Client.java:19: cannot find symbol
symbol  : class Socket
location: class Client
Socket socket;
        ^
D:\JCreator Pro\MyProjects\Client.java:116: cannot find symbol
symbol  : class Socket
location: class Client.ClientThread
private Socket socket;
                        ^
D:\JCreator Pro\MyProjects\Client.java:124: cannot find symbol
symbol  : class Socket
location: class Client.ClientThread
public ClientThread(Socket s)throws IOException
                                    ^
D:\JCreator Pro\MyProjects\Client.java:68: cannot find symbol
symbol  : class Socket
location: class Client
socket = new Socket("192.168.1.3",8049);
                                     ^
Note: D:\JCreator Pro\MyProjects\Client.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
4 errorsProcess completed.