java - 线程类中的编译错误

Question

我有一个class（下面）但是每当我尝试编译代码时，我都会收到一个错误，指出classis not abstract。

谁能解释这意味着什么以及我需要做些什么不同的事情？

package huntermessenger;

import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.util.Scanner;

public class HunterClient implements Runnable {
    private static final String SERVER_IP = "127.0.0.1";
    private static final int SERVER_PORT = 5000;
    Scanner scanner = new Scanner(System.in);   //to read text from the console
    Socket socket = null;

    public void Run() {
        try {
            socket = new Socket(SERVER_IP, SERVER_PORT);
            System.out.println("Connected to server");
        } 
        catch (Exception ex) {
            System.out.println("Error connecting to server: " + ex.getMessage());
        }
        ObjectInputStream in = null;
        ObjectOutputStream out = null;
        while (true) {
            try {
                if (out == null) {
                    out = new ObjectOutputStream(socket.getOutputStream());
                }

                //read a string
                System.out.println("Enter a message: ");
                String str = scanner.next();

                //send it to server
                out.writeObject(new Message(str));
                out.flush();

                //get the reply from the server
                if (in == null) {
                    in = new ObjectInputStream(socket.getInputStream());
                }
                Message message = (Message) in.readObject();
                System.out.println("Server said: " + message.getMessage());

            } 
            catch (Exception ex) {
                System.out.println("Error: " + ex);
            }
        }
    }
}

Answer 1

java区分大小写：

public void Run() {

不一样

public void run() {

你需要执行run()not Run()。

只需将其更改为

public void run() {

Answer 2

public void Run() {}

Run() 不应大写。run() 是一个抽象方法，因为您正在实现 Run() 而不是覆盖它。因此，您的类仍然有一个抽象方法，但该类不是抽象的，因此会出现错误。