How to Create Turn-Based Games

Newbie & Debugging Questions
#1

i have programmed java game where only one player kann play and hit the enemy an then i want to make it turn-based game.
I recherched in the internet but i don’t find any help. Hier is a detail to my code (see below).
I used the java.util.Timer class to create Turn-Based Game but it doesn’t work
correctly. I tested it with 2 player. the first player get 1000 ms time but the second only 100 ms.
is my method correct?
Can you tell me wehre can i find help or better concept, tutorials etc to make my game turn-based.
Thanks!

1)GamePanel.java

void init() {
…
new GameLevel1State();
…
running = true;
}

public void run() {
init();

	// Timers
	long start;
	long elapsed;
	long wait;

	// Game loop
	while (running) {
		start = System.nanoTime();

		update();
		draw();

		elapsed = System.nanoTime() - start;
		wait = targetTime - elapsed / 1000000;
		if (wait < 0)
			wait = 0;

		try {
			Thread.sleep(wait);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

2)GameLevel1State.java
…
…
Timer timer;
public GameLevel1State(…) {
…;
init();
}

public void init() {
…
…
timer = new Timer();
timer.schedule(new TurnBasedTask(), 0,1000);

}

class TurnBasedTask extends TimerTask {
public void run() {
setActiveSpieler();
}

}
}