feat: 게임 애플리케이션 구현

corock/src/main/java/com/cowaine/corock/mission/game/client/GameClient.java

@@ -0,0 +1,38 @@
+package com.cowaine.corock.mission.game.client;
+
+import com.cowaine.corock.mission.game.io.OutputView;
+
+import java.io.IOException;
+import java.net.Socket;
+import java.net.UnknownHostException;
+
+/**
+ * A GameClient is a client that uses the game.
+ */
+class GameClient {
+
+    private final String userId;
+
+    GameClient(String userId) {
+        this.userId = userId;
+    }
+
+    void connect(String serverHost, int port) {
+        try {
+            Socket socket = new Socket(serverHost, port);
+            OutputView.printConnectToServer(serverHost, port);
+
+            Thread sender = new Sender(socket, userId);
+            sender.start();
+
+            Thread receiver = new Receiver(socket);
+            receiver.start();
+
+        } catch (UnknownHostException e) {
+            OutputView.printUnknownHostException(e.getMessage());
+        } catch (IOException e) {
+            OutputView.printIoException(e.getMessage());
+        }
+    }
+
+}

corock/src/main/java/com/cowaine/corock/mission/game/client/GameClientShell.java

@@ -0,0 +1,26 @@
+package com.cowaine.corock.mission.game.client;
+
+import com.cowaine.corock.mission.game.server.ServerConfig;
+
+/**
+ * Game client in the shell.
+ */
+public class GameClientShell {
+
+    /**
+     * The main method for playing the game.
+     *
+     * @param args The user's ID
+     */
+    public static void main(String[] args) {
+        if (args.length == 0) {
+            throw new IllegalArgumentException("게임에 사용할 아이디를 설정해주세요.");
+        }
+
+        String userId = args[0];
+        GameClient client = new GameClient(userId);
+
+        client.connect(ServerConfig.serverHost(), ServerConfig.port());
+    }
+
+}

corock/src/main/java/com/cowaine/corock/mission/game/Receiver.java → corock/src/main/java/com/cowaine/corock/mission/game/client/Receiver.java

@@ -1,10 +1,10 @@
-package com.cowaine.corock.mission.game;
+package com.cowaine.corock.mission.game.client;
 
 import java.io.DataInputStream;
 import java.io.IOException;
 import java.net.Socket;
 
-public class Receiver extends Thread {
+class Receiver extends Thread {
 
     private final DataInputStream in;
 
@@ -25,9 +25,19 @@ private boolean isReceivable() {
 
     private void receiveMessage() {
         try {
-            System.out.println(in.readUTF());
+            String response = in.readUTF();
+            if (isQuitTheGame(response)) {
+                this.interrupt();
+                System.exit(0);
+            }
+            System.out.print(response);
         } catch (IOException e) {
+            System.err.println(e.getMessage());
         }
     }
 
+    private boolean isQuitTheGame(String response) {
+        return response.equals("quit");
+    }
+
 }