I have recently started using Java, but have been programming in javascript, and actionscript 3 for a while.

I am used to the language giving me the ability to simply do something like:

private function Update(){
//stuff
}

or something similar to that.

I am looking for something similar in Java, and I want to make sure I am doing it correctly.

I started following a tutorial, and they said to do something like this:

 long lastTime = System.nanoTime();
        double amountOfTicks = 60.0;
        double ns = 1000000000;
        double delta = 0;
        long timer = System.currentTimeMillis();
        int frames = 0;
        while(running){
            long now = System.nanoTime();
            delta += (now - lastTime) / ns;
            lastTime = now;
            while(delta >= 1){
                tick();
                delta--;
            }
            
            if(running)
                render();
            frames++;
            
            if(System.currentTimeMillis() - timer > 1000){
                timer += 1000;
                System.out.println("FPS: " + frames);
                frames = 0;
            }
        }

This seems to be every second calling the tick() function, not the same as every frame though, and while things tend to happen in less time than a second, I would much rather use the same old frame by frame method i was using. (Unless someone can give me a reason not to, always up for an opinion)

So I am wondering, why not just do something like:

while(running){
Update();
}

I believe this would call every frame. Am I doing something completely crazy here? is there a much better method?

Thanks in advance