Ultimate PK Smash

This is a project for Java college course, which was implemented by a three-person team consisting of @Rafa13io, @JakubDralus and @Veczar. It is a tactical 1vs1 fighting game inspired by Pokemon games and was done in basically 3 days to challenge ourselves.

Technologies Used

• Java 19
• JavaFX
• JDBC PostgreSQL Driver
• PostgreSQL

Details

Server Connection

Its based a client-server communication concept using Java java.net.ServerSocket.

Server side:

public Server(int port) throws Exception {
    serverSocket = new ServerSocket(port); // 25800
    run(); // start the server
}

Client Side:

new Thread(() -> {
  try {
      // Establish a socket connection
      socket = new Socket("localhost", 25800);
      
      // Create object output and input streams
      outputStream = new ObjectOutputStream(socket.getOutputStream());
      inputStream = new ObjectInputStream(socket.getInputStream());
      
      // Create a RegisterReq object and send it
      LogInReq logInReq = new LogInReq(username.getText(), password.getText());
      System.out.println("sending login request: " + logInReq);
      outputStream.writeObject(logInReq);
...

Each user has to register/log-in in order to play. Each logged user has its own game session and thus he has its own individual thread running on the server using java.util.concurrent.FutureTask.

  User user = userService.getUser(logInReq.getUserName(), logInReq.getUserPassword());
  output.writeObject(new LogInResp(true, user));
  UserSession userSession = new UserSession(socket, user, output, input);
  FutureTask<SessionEndStatus> futureTask = new FutureTask<SessionEndStatus>(userSession);
  executorService.submit(futureTask);

When two players are in queue for a battle, the server matches them and they can start playing right away.

Database Connection

We are using PostgreSQL database and connecting via JDBC.
Here we are storing information about each registered player, smashers, their abilities and also battle history.

public static void connectToDatabase() throws SQLException {
    String dbName = "ultimatepksmashers";
    String url = "jdbc:postgresql://localhost:5432/";
    
    try {
        connection = DriverManager.getConnection(url, "postgres", PASSWORD);
        PreparedStatement statement = connection.prepareStatement("CREATE DATABASE " + dbName);
        statement.executeUpdate();
        System.out.println("created database " + dbName + " schema: " + connection.getSchema());
    }
    catch (Exception e) {
        // if already exists: make connection
        url = "jdbc:postgresql://localhost:5432/" + dbName;
        connection = DriverManager.getConnection(url, "postgres", PASSWORD);
        System.out.println("connected to database " + dbName + " schema: " + connection.getSchema());
    }
}

Gameplay

Each player with one of "Smashers" form their collection can fight in a tour based fight in order to determine who is better.

• Each turn a player must select one of 3 attacks and one of 2 defence abilities and then click submit.
• When two players make their choices, the damage dealt is calculated and both of their HP is updated.
  The HP update order is determined by a hidden star called 'ECTS' points: if your smasher have more of them, he attacks first (his damage dealt is calculated first).
• Battle ends when one of the "Smasher" gets below 0 HP.
• Winner gets new random "Smasher" to their collection.

Note: The UI creation was rushed and was not a priority in this project.