Question

I’m pretty new to Java (C# programmer) and I have here a problem that I dont understand. Sorry for the crappy english. =)

I’m working on a simple Snake game, I have different classes, enums etc.. My problem is, if I call the JFrame with the game from the Menu class, it doesnt do anything. I can debug through the code but it doesnt draw anything. If I start the Game class direct from the Main method, there is no problem.

I think that its a simple error and im just to stupid to see it.

Here the code:

Mouse Event:

else if (mouseX > 75 && mouseX < 175 && mouseY > 260
                && mouseY < 285) {
            startGame();

startGame method in the Menu class:

public void startGame(){
    this.setVisible(false);
    game = new Game();
}

Game Constructor:

public Game() {
    super("Snake V 0.1");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setSize(940, 620);
    setLocation(200, 200);
    addKeyListener(keyListener);
    setVisible(true);
    //this.createBufferStrategy(2);

    zeichnung.addFigur(new Field(0, 0));
    snake = new Snake(40, 300, 1);
    zeichnung.addFigur(snake);
    zeichnung.addFigur(new Diamond());

    this.getContentPane().add(jpanel);

    this.repaint();

    this.Intervall();
}

Intervall:

public void Intervall() {
    while (true) {
        try {
            snake.direction = keyListener.getDirection();
            zeichnung.checkCollision(snake);
            snake.move();
            this.repaint();
            Thread.sleep(150);
        } catch (InterruptedException e) {
            // TODO: handle exception
        }
    }
}

As i said before. If I start the Game class direct from Main method (simple with Game game = new Game();) there is no problem.

I hope I dont forgot any important information.

Answer 1

It shouldn’t work at all in any Swing GUI.

Thread.sleep() kills repainting and listening.

see final post here for example of problem

http://www.coderanch.com/t/600642/GUI/java/update-getGraphics

use a Swing Timer instead