Java 不能在两个实例中运行同一个类

我尝试使用线程将2个或更多客户端连接到java服务器，但当我尝试多次运行我的类客户端时，它会说

“客户端”不允许并行运行。 你想停止跑步吗

我想要这样的东西

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class Server {

    private static String[] names = {"Willy", "Felix", "Piotr"};
    private static String[] adjs = {"the gentle", "the un-gentle", "the urbane"};
    private static final int PORT = 9090 ;

    private static ArrayList<ClientHandler> clients = new ArrayList<>();
    private static ExecutorService pool = Executors.newFixedThreadPool(5);



    public static void main(String[] args) throws IOException {

        //utworzenie nowego socketu
        ServerSocket listener = new ServerSocket(PORT);

        while(true)
        {
            System.out.println("Serwer czeka na polaczenie...");
            //akceptowanie polaczenia
            Socket client = listener.accept();
            System.out.println("S: Polaczono z klientem");
            ClientHandler clientThread = new ClientHandler(client);
            clients.add(clientThread);

            pool.execute(clientThread);
        }



    }

    public static String getRandomName()
    {
        String name = names[(int)(Math.random()*names.length)];
        String adj = adjs[(int)(Math.random()*adjs.length)];
        return name + " " + adj;
    }
}

编辑：

我注意到，如果我在cmd中运行这个程序，一切正常，我可以连接2个或更多的客户端，而不会出现任何问题

问题是，由于“并行”错误，我无法在intelliJ中执行此操作

我的代码是这样的

import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class Server {

    private static String[] names = {"Willy", "Felix", "Piotr"};
    private static String[] adjs = {"the gentle", "the un-gentle", "the urbane"};
    private static final int PORT = 9090 ;

    private static ArrayList<ClientHandler> clients = new ArrayList<>();
    private static ExecutorService pool = Executors.newFixedThreadPool(5);



    public static void main(String[] args) throws IOException {

        //utworzenie nowego socketu
        ServerSocket listener = new ServerSocket(PORT);

        while(true)
        {
            System.out.println("Serwer czeka na polaczenie...");
            //akceptowanie polaczenia
            Socket client = listener.accept();
            System.out.println("S: Polaczono z klientem");
            ClientHandler clientThread = new ClientHandler(client);
            clients.add(clientThread);

            pool.execute(clientThread);
        }



    }

    public static String getRandomName()
    {
        String name = names[(int)(Math.random()*names.length)];
        String adj = adjs[(int)(Math.random()*adjs.length)];
        return name + " " + adj;
    }
}

---

我一直在试图找出问题所在，但无能为力。有什么想法吗？

我正在运行您的代码，但我没有得到错误，也许您需要增加java虚拟机。因为我的默认值是12000MB

要增加java内存，可以执行以下操作

---

如果没有功能，您需要检查ide，我使用了netbeans

非常感谢！我已经安装了netbeans，它很有帮助，我想我在intellij ide中弄乱了一些东西，所以我会尝试卸载它。我做到了，点击了你帖子旁边的v按钮。还可以吗？还有一个问题-您是如何在console中更改名称的？它的运行（服务器）和运行（客户端），我得到了JavaAplication#1、JavaAplication#2等。ide改变了它的

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

public class ClientHandler implements Runnable{

    //zmienne dla socketa i bufferow z dateserver
    private Socket client;
    private BufferedReader in;
    private PrintWriter out;

    public ClientHandler(Socket clientSocket) throws IOException {
        this.client = clientSocket;
        in = new BufferedReader(new InputStreamReader(client.getInputStream()));
        out = new PrintWriter(client.getOutputStream(), true);

    }


    @Override
    public void run() {
        try{
            while (true) {
                String request = in.readLine();
                if (request.contains("name")) {
                    out.println(Server.getRandomName());
                } else {
                    out.println("Type 'tell me a name' to get random name");
                }

            }

        } catch (IOException e) {
            System.err.println("IO exception in client handler");
            System.err.println(e.getStackTrace());
        }finally {
            out.close();
            try {
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }


}