Exceptionjava.net.ConnectException: Connection refused: connect

我的程序如下：
客户端：
import java.io.*;
import java.net.*;public class Client 
{
    PrintStream streamToServer;
    BufferedReader streamFromServer;
    Socket toServer;
    public   Client()
    {
     connectToServer();
    }
    private void connectToServer()
    {
     try
     {
     String name;
     toServer = new Socket("localHost",1001);
     streamFromServer = new BufferedReader(new InputStreamReader((toServer.getInputStream())));
     streamToServer = new PrintStream(toServer.getOutputStream());
     System.out.print("Enter connection name:");
     BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
     name = reader.readLine();
     streamToServer.println(name);
     String str = streamFromServer.readLine();
     System.out.println("The Server says:"+str);
     }
     catch(Exception e)
{
System.out.println("Exception"+e);
    }
    }
    

public static void main(String[] args) 
{ new Client(); }}服务器端：
import java.io.*;
import java.net.*;
public class Server implements Runnable 
{
    ServerSocket serverSocket;
    PrintStream  streamToClient;
    BufferedReader streamFromClient;
    Socket fromClient;
    static int count = 0;
    Thread thread;
    public void Server()
    {
     try
     {
     serverSocket = new ServerSocket(1001);
     }
     catch (Exception e)
     {
     System.out.println("Socket could not be created"+e);
     }
     thread = new Thread(this);
     thread.start();
    }
    public void run()
    {
     try
     {
     while(true)
     {
     fromClient = serverSocket.accept();
     count++;
     System.out.println("Client connection no:"+count);
     streamFromClient = new BufferedReader(new InputStreamReader((fromClient.getInputStream())));
     streamToClient = new PrintStream(fromClient.getOutputStream());
     String str = streamFromClient.readLine();
     System.out.println("Client connection name:"+str);
     streamToClient.println("Welcome"+str);
    
     }
        }
     catch(Exception e)
     {
     System.out.println("Exception"+e);
     }
     finally
     {
     try
     {
     fromClient.close();
     }
     catch(Exception e1)
     {
     System.out.println("Could not close connection"+e1);
        }
     }
    }

public static void main(String[] args) {
// TODO 自动生成方法存根
          new Server();
}}
执行时显示上面的结果请问是什么原因？
是因为端口不对吗？
我不知道我的默认端口应该怎么查找