Removed..

[JL235]

GPU will get less heat(less malfunction) if you just draw everything on short period and rest until next frame.

Exactly. This idea that you need to rest between _every_ draw is simply not true, and will end up using more power, and generate more heat.

Graphics cards can trivially draw 200 to 400 images per frame.

[sproingie]

I do not know why i should look jdk7 as i will be using java 1.5 classes.

Java7 didn't change the implementation, they changed the docs to be more accurate.  The behavior of Thread.yield() is os-dependent.  In fact, from poking around hotspot's code, it looks like there are places where yield is temporarily disabled, i.e. it does nothing at all.  Solaris has a mode where more than 100 yields/sec are ignored, and so on.

The short of it is, yield will probably lower the total CPU usage simply because the OS scheduler may sleep it as a side effect, but you cannot depend on there being a sleep or in fact having yield do anything at all.  It's a hint, nothing more.

[Ultroman]

you have to put on a variable the time you started your iteration, then do logic and draw, take the difference from the start of iteration, then sleep (40- iterationTime) .

1   2   3   4   5   6   7   8   9

long startOfIteration= System.nanoTime(); //do logic //do draw long delay = (System.nanoTime() - startOfIteration)/1000000 - 40; if (delay>0)    Thread.sleep(delay);

That's the moneymaker. Many thanks for that, teletubo. This really smooths out the drawing, compared to using a static sleep(long)