Socket有关问题

Socket问题
最近在学JAVA,看到Socket这章,里面有这样一个例子
主要是实现客户端与服务器端的通讯,但是为什么在我的电脑上运行就是不行
我先启动服务器端,再去启动客户端,但是当客户端一启动的时候服务器端就出现这样的错误:Error:java.lang.nullpointerException
客户端也会提示这样的错误:Error:java.net.socketException:Connection   reset
哪位大哥帮忙下啊,感激不尽啊
这个是客户端代码:
import   java.net.*;
import   java.io.*;
public   class   SingleClient   {

/**
  *   @param   args
  */
public   static   void   main(String[]   args)   {
//   TODO   Auto-generated   method   stub

try
{
Socket   clientsocket   =   new   Socket( "127.0.0.1 ",4350);
BufferedReader   breader1   =   new   BufferedReader(new   InputStreamReader(System.in));
PrintWriter   prinout   =   new   PrintWriter(clientsocket.getOutputStream());
BufferedReader   breader2   =   new   BufferedReader(new   InputStreamReader(clientsocket.getInputStream()));
System.out.print( "请输入你要聊天的信息:   ");
String   linestring   =   breader1.readLine();
while(!linestring.equals( "finished "))
{
prinout.println(linestring   +   "\n ");
prinout.flush();

System.out.print( "Client   : "   +   linestring   +   "\n ");
System.out.print( "Server:   "   +   breader2.readLine()   +   "\n ");
System.out.print( "请再输入聊天信息: ");
linestring   =   breader1.readLine();
}
prinout.close();
breader2.close();
clientsocket.close();
}
catch(Exception   e)
{
System.out.print( "Client   Error:   "   +   e);
}
}

}
这个是服务端代码:
import   java.net.*;
import   java.io.*;
public   class   SingleServer   {

/**
  *   @param   args
  */
public   static   void   main(String[]   args)   {
//   TODO   Auto-generated   method   stub

try
{
ServerSocket   serversocket   =   null;
try
{
  serversocket   =   new   ServerSocket(4350);
}
catch(Exception   e)
{
System.out.print( "Con 't   Connection   to   the   client! ");
}
Socket     myclient   =   null;
try
{
serversocket.accept();
}
catch(Exception   e)
{
System.out.print( "the   Error   is     "   +   e);
}

String   readstring;
BufferedReader   serverreader1   =   new   BufferedReader(new   InputStreamReader(myclient.getInputStream()));
PrintWriter   serverprint   =   new   PrintWriter(myclient.getOutputStream());
BufferedReader     serverreader2   =   new   BufferedReader(new   InputStreamReader(System.in));
System.out.print( "Clinet:   "   +   serverreader1.readLine());

System.out.print( "请在服务器端输入你要聊天的信息:   ");
readstring   =   serverreader2.readLine();
while(!readstring.equals( "finished "))
{
serverprint.println(readstring   +   "\n ");
serverprint.flush();

System.out.print( "Server:   "   +   readstring   +   "\n ");