Question

使用Error: Could not find or load main class KnockKnockServer运行以下代码时获取java KnockKnockServer 4444，即使目录中存在类文件 KnockKnockServer.class 。

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 import java.net.*;
 import java.io.*;

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

    ServerSocket serverSocket = null;
    try {
        serverSocket = new ServerSocket(4444);
    } catch (IOException e) {
        System.err.println("Could not listen on port: 4444.");
        System.exit(1);
    }

    Socket clientSocket = null;
    try {
        clientSocket = serverSocket.accept();
    } catch (IOException e) {
        System.err.println("Accept failed.");
        System.exit(1);
    }

    PrintWriter out = new PrintWriter(clientSocket.getOutputStream(), true);
    BufferedReader in = new BufferedReader(
            new InputStreamReader(
            clientSocket.getInputStream()));
    String inputLine, outputLine;
    KnockKnockProtocol kkp = new KnockKnockProtocol();

    outputLine = kkp.processInput(null);
    out.println(outputLine);

    while ((inputLine = in.readLine()) != null) {
         outputLine = kkp.processInput(inputLine);
         out.println(outputLine);
         if (outputLine.equals("Bye."))
            break;
    }
    out.close();
    in.close();
    clientSocket.close();
    serverSocket.close();
}
}

Answer 1

如果您未在命令行上传递类路径，则会考虑CLASSPATH环境变量。并且只有当它没有被设置时，它才会考虑默认值，即＆＃34;。＆＃34;

因此，要么取消设置CLASSPATH环境变量，要么在命令行上传递-cp .。

即使存在.class文件也没有类错误

1 个答案: