Java 客户端服务器套接字错误：java.net.BindException：地址已在使用：绑定

Question

This is the server side code I'm pretty sure the error is that the Server Socket Isn't closing the port? There is no problem when I run the program but, When I run it again I get this Error:

Exception in thread "main" java.net.BindException: Address already in use: bind
    at java.base/sun.nio.ch.Net.bind0(Native Method)
    at java.base/sun.nio.ch.Net.bind(Net.java:550)
    at java.base/sun.nio.ch.Net.bind(Net.java:539)
    at java.base/sun.nio.ch.NioSocketImpl.bind(NioSocketImpl.java:643)
    at java.base/java.net.ServerSocket.bind(ServerSocket.java:396)
    at java.base/java.net.ServerSocket.<init>(ServerSocket.java:282)
    at java.base/java.net.ServerSocket.<init>(ServerSocket.java:173)
    at internet.server.main(server.java:11)

But if I change the port number it fixes for that one time running. Someone please help also I haven't learned java server sockets or client sockets yet soo I need help as far as I know no one else is having this problem

package internet;

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

public class server {

    public static void main(String[] args) throws IOException {
        println("Compiled");
        ServerSocket ss = new ServerSocket(5502);
        Socket s = ss.accept();
        println("Client Connected!");
        InputStreamReader in = new InputStreamReader(s.getInputStream());
        BufferedReader bf = new BufferedReader(in);
        String str = bf.readLine();
        println("Client: " + str);
        
        s.close();
        ss.close();
            
    }
    
    public static void println(String args) {
        System.out.println(args);
    }
}

Answer 1

This will works fine as long as you terminate your previous execution before you re run it.

Answer 2

Try closing those streams, InputStreamReader and BufferedReader as well. Close them before socket and ServerSocket.

bf.close();
in.close();