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Asked: 2026-05-27T17:55:49+00:00

I have a java program which emulates a car fabric. I wrote an explanation,

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I have a java program which emulates a car fabric. I wrote an explanation, but it would be pretty hard to understand and not really useful, so I’ll just ask the “abstract” question.

I have an infinite loop which calls the method “now” wich tells the fabric to build a new car.

    while(true){
        try{
            Thread.sleep(500);
        }catch (Exception e) {;}
        fabric.now();
    }

Inside the fabric there are 3 zones; stage 0 where the body of the car is created, stage 1 where the car is provided with lights, stage 2 where I put a bumper on it and finished which is the place where all finished cars are placed.

When the menthod now is called for the very first time, it creates the body of the car in the stage 0. Then, when it’s called for the 2nd time, it moves the first body to stage 1, it puts the lights of the car (by drawing two circles) and it creates a new body. It goes on this way until the car is ready, which is when it’s moved to the finished zone.

Here is my problem. The 2nd time I call the now method, it does 3 things:

i. it paints a car-body in the 1 stage
ii. it paints a new car-body in the 0 stage
iii. it paints the lights over the car-body on the 1 stage.

I want to delay the step (iii) so people can see the car being provided with lights. If I use wait, thread.sleep, or do a cycle wich takes x milliseconds, it delays the whole fabric from then on.
I think what I need is to take the (iii) step out of the normal flow and do it separately, so when I wait 350 milliseconds before painting the lights it doesn’t delay the rest of the fabrication-process. (the rest of the painting).

Any ideas?

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1 Answer

  1. Editorial Team

    Here is my assumption about your question:
    you want to call now() method at regular interval of say 500ms. Now irrespective of the you want to delay the subtask 3 inside the now(). This also means the delay in subtask 3 should not delay the call to now() at every 500ms

    If this is your requirement then I suggest you using java.util.Timer.scheduleAtFixedRate

    Simply create a TimerTask and wrap your now() call inside it.

    Use wait(500) or how much ever you want in subtask 3.

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