根据布尔值是true还是false来删除/添加JComponent

Question

In a game that I am currently making I have just created a starting screen. That starting screen have 4 JButton s Play, Options, Credit and Quit. If you press Play another JButton will appear, New Game.

I wan't to make it so that when you press the New Game button the starting screen disapears and the game start (both the acctual game and the staring screen extends JComponent ).

I have a seperate class that runs the game and handels the in-game option menu.

In the starting screen class I have a boolean called startGame, that boolean equals to false by default and when you press the New Game button it will equal to true. In the starting menu class I also have a public method that returns the value of startGame, it looks like this.

public boolean checkGame(){
    return startGame;
}

In the main class that runs the game I check if the checkGame method equals to true or false by using a Timer like this.

if(menu.checkGame() == false){
            frame.add(menu);
        }
        Timer timer = new Timer(5, new ActionListener(){
            public void actionPerformed(ActionEvent e){
                if(menu.checkGame() == true){
                    frame.remove(menu);
                    frame.add(new Level1());
                }
            }
        });
        timer.start();

Obviously this does not work because if it would I would not be asking this question. So now to my question, how would I make it work like I want?

Answer 1

In your second code snippet, the Timer only runs its task once. Perhaps you want a ScheduledExecutorService to repeatedly check, for example:

    final ScheduledExecutorService scheduledExecutor =
            Executors.newSingleThreadScheduledExecutor();

    scheduledExecutor.scheduleAtFixedRate(new Runnable() {
        @Override
        public void run() {
            EventQueue.invokeLater(new Runnable() {
                @Override
                public void run() {
                    if (menu.checkGame()) {
                        frame.remove(menu);
                        frame.add(new Level1());
                        scheduledExecutor.shutdown();
                    }
                }
            });
        }
    }, 5, 5, TimeUnit.MILLISECONDS);