Java - condition statement based on milliseconds

Question

Quick question here, I need to execute a certain method only after a specific time period has passed (in milliseconds):

static double incrTrueBinaryErr = 62.5;
static double incrTrueBinaryMov = 31.25;
static double incr01001 = 360000;
static double incr_1101 = 125;
static double incr05008 = 3600000;
static double incr10004 = 1024000;
static double incr22000 = 1000;
static double incr22001 = 1000;

Date currDate;

    while (true)
    {
    currDate = new Date();

    if (currDate.getTime() == currDate.getTime() + incrTrueBinaryErr)
        //do stuff

    if (currDate.getTime() == currDate.getTime() + incrTrueBinaryMov)
        //do stuff

    if (currDate.getTime() == currDate.getTime() + incr01001)
        //do stuff

    if (currDate.getTime() == currDate.getTime() + incr_1101)
        //do stuff

    if (currDate.getTime() == currDate.getTime() + incr05008)
        //do stuff

    if (currDate.getTime() == currDate.getTime() + incr10004)
        //do stuff

    if (currDate.getTime() == currDate.getTime() + incr22000)
        //do stuff

    if (currDate.getTime() == currDate.getTime() + incr22001)
        //do stuff

    }

However, my program never hits any of these because of how specific the time intervals are.

What is the best way to go about doing this?

Answer 1

This kind of expression currDate.getTime() == currDate.getTime() + incr01001 will evaluate to true only if incr01001 == 0 . For the same reason x == x + y only when y == 0 .

Answer 2

To execute a certain method only after a specific time period has passed (in milliseconds):

You can use Thread.sleep(long milliseconds) method to do that.

try{
  Thread.sleep(5000);//for 5 seconds
} catch(Exception ex){
  System.out.println("Error: "+ex.getMessage());
}

Answer 3

Try getting the time outside your while block first:

Date date = new Date();
while (true)
{
  currDate = new Date();

  if (currDate.getTime() == date.getTime() + incrTrueBinaryErr)
    //do stuff
  //etc.
}

This way the while loop doesn't keep reassigning the date.

It might also be a bit too specific as you say, so for your if block maybe:

long timeDifference = date.getTime()+incrTrueBinaryErr-currDate.getTime();

if (Math.abs(timeDifference)<5l)
  //do stuff

If the new time is within 5 milliseconds of what you want, "do stuff".