implemate all class

src/main/java/chat/ChatClient.java

@@ -37,19 +37,26 @@ public class ChatClient {
     }
 
     private void connectToServer() throws IOException {
-        // TODO: create socket connection to host:port
+        socket = new Socket(this.host , this.port);
-        // TODO: initialize output stream (PrintWriter)
+        out = new PrintWriter(socket.getOutputStream() , true);
-        // TODO: initialize input stream (BufferedReader)
+        in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
     }
 
     private void readUserInputAndSend() throws IOException {
-        // TODO: read continuously from console
+        String userInput;
-        // TODO: send each input line to server
+        while ((userInput = consoleReader.readLine()) != null){
+            out.println(userInput);
+        }
     }
 
     private void cleanup() {
-        // TODO: close socket safely
+        try {
-        // TODO: release resources
+            if(socket != null && !socket.isClosed()) {
+                socket.close();
+            }
+        } catch (IOException e) {
+            System.err.println("Error closeing client +" +  e.getMessage());
+        }
     }
 
     public static void main(String[] args) {

src/main/java/chat/ChatServer.java

@@ -39,20 +39,26 @@ public class ChatServer {
     }
 
     public void broadcast(String message, ClientHandler sender) {
-        // step 1: iterate through connectedClients safely
+        synchronized (connectedClients){
-        // step 2: skip the sender client
+            for(ClientHandler clientHandler : connectedClients){
-        // step 3: send message to remaining clients using sendMessage
+                if(clientHandler != sender){
+                    clientHandler.sendMessage(message);
+                }
+            }
+        }
     }
 
     public void broadcastSystemMessage(String message) {
-        // step 1: iterate through all connected clients
+        synchronized (connectedClients){
-        // step 2: send system message to each client
+            for(ClientHandler clientHandler : connectedClients){
+                    clientHandler.sendMessage(message);
+            }
+        }
     }
 
     public void removeClient(ClientHandler clientHandler) {
-        // step 1: remove client from connectedClients set
+        connectedClients.remove(clientHandler);
-        // step 2: retrieve username from clientHandler
+        broadcastSystemMessage("[System]" + clientHandler.getUsername()+ "left th chat");
-        // step 3: broadcast system message about user leaving
     }
 
     public static void main(String[] args) {

src/main/java/chat/MessageListener.java

@@ -13,7 +13,13 @@ public class MessageListener implements Runnable {
 
     @Override
     public void run() {
-        // TODO: continuously read messages from server
+        try {
-        // TODO: print received messages immediately
+            String message;
+            while ((message = inputReader.readLine()) != null){
+                System.out.println(message);
+            }
+        }catch (IOException e){
+            System.err.println(e.getMessage());
+        }
     }
 }