Question

When I have made simple single thread games I implemented the game logic in much the same way that the increasingly famous Space Invaders tutorial does as shown below:

public static void main(String[] args) { //This is the COMPLETE main method
    Game game = new Game(); // Creates a new game.
    game.gameLogic(); // Starts running game logic.
}

Now I want to try and run my logic on a separate thread but I am having problems. My game logic is in a separate class file which looks like this:

public class AddLogic implements Runnable {

    public void logic(){
        //game logic goes here and repaint() is called at end
    }

    public void paintComponent(Graphics g){
        //paints stuff
    }

    public void run(){
        game.logic();  //I know this isn't right, but I cannot figure out what to put here.  Since run() must contain no arguments I don't know how to pass the instance of my game to it neatly.
    }

}

… And my main method looks like this:

public static void main(String[] args) { //This is the COMPLETE main method
    Game game = new Game(); // Creates a new game.
    Thread logic = new Thread(new AddLogic(), "logic");  //I don't think this is right either
    logic.start();

}

How do I properly call the logic() method on the instance of my game?

Answer 1

you can just pass your game instance by using a constructor, or a setter like in

public GameThread extends Thread {
  private Game game;

  GameThread(Game game) {
    this.game = game;
  }

  public void run() {
    game.logic();
  }
}

public static void main(String[] args) {
  GameThread thread = new GameThread(new Game());
  thread.start();
}