server completed

src/Server.java

 import java.io.IOException;
 import java.net.ServerSocket;
 import java.net.Socket;
+import java.net.SocketTimeoutException;
 import java.util.ArrayList;
 
 public class Server {
     private static final int PORT = 4321;
     private ServerSocket serverSocket;
-    private ArrayList<String>user;
-    public Server() throws Exception {
+    private ArrayList<String> user;
+
+    public Server() throws IOException {
         serverSocket = new ServerSocket(PORT);
-        user=new ArrayList<>();
+        user = new ArrayList<>();
+        serverSocket.setSoTimeout(1000);
+    }
 
+    public void run() {
         while (true) {
+            try {
+                System.out.println("Waiting for client on port " +
+                        serverSocket.getLocalPort() + "...");
                 Socket client = serverSocket.accept();
                 ClientHandler clientHandler = new ClientHandler(client);
+                client.close();
+
+            } catch (SocketTimeoutException s) {
+                System.out.println("Socket timed out!");
+                break;
+            } catch (IOException e) {
+                e.printStackTrace();
+                break;
+            } catch (Exception e) {
+                e.printStackTrace();
             }
         }
+
+    }
 }
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