Type mismatch: cannot convert from List<Object> to List<Socket>

Question

import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class MyServer {
    //定义保存所有Socket的ArrayList,并将其包装为线程安全
    public static List<Socket> socketList = Collections.synchronizedList(new ArrayList<>());
    public static void main(String[] args)throws IOException{
        ServerSocket ss=new ServerSocket(3000);
        while(true){
            Socket s=ss.accept();
            socketList.add(s);
            new Thread(new ServerThread(s)).start();
        }
    }
}

Why I run the program,the Console shows that"Exception in thread "main" java.lang.Error: Unresolved compilation problem: at com.eyck.inet.MyServer.main(MyServer.java:14)"
the error seems in line 9.

Possible duplicate of Error casting Object[] to ContentValues[] — L. Swifter
– L. Swifter, Commented Aug 16, 2016 at 2:52

EyckWu · Accepted Answer · 2016-08-16 03:19:59Z

0

after modifying the line 9 to

    public static List<Socket> socketList
       =Collections.synchronizedList(new ArrayList<Socket>());

can solve the question.

answered Aug 16, 2016 at 3:19

EyckWu

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