Re: sampling rate problem

I have a thread that records mouse positions at 100Hz, but I can't get
the desired sampling rate. The simplified code is:

static int mousepos_x, mousepos_y; // updated by another class
int[][] samples = new int [15000][2];
int count = 0;
....
public class SampleMouse implements Runnable {
....
    public void run () {
        while (running) {
           samples[count][0] = mousepos_x;
           samples[count++][1] = mousepos_y;
           Thread.sleep(10);
        }
    }
}

I also tried in the run method with another algorithm:

long starttime; // (class scope variable) in ns

while (running) {
    if (System.nanoTime() > starttime + count*10*1000000) {
        samples[count][0] = mousepos_x;
        samples[count++][1] = mousepos_y;
    }
}

I also tried setting the thread priority to max.

With any of the approaches, I get a discrepancy of over 20%

Does anyone have a good way to get the desired sampling rate?