How to find if a constantly changing integer has been the same value for 3 seconds

Question:

How to find if a constantly changing integer has been the same value for 3 seconds ant not disturb other actions of the program for those 3 secs.

Code:

import java.util.*;
import java.text.*;
 
public class TimerExample {
 
   static int x=0;
   static int timerx = x;
 
   public static void main(String[] args) {
 
      class MyTimeTask extends TimerTask {
        public void run() {
          if(timerx != x) {
            timerx=x;
            System.out.println("x changed: " + x);
          }
          System.out.println("x: " + x);
        }
      }
 
      Timer timer = new Timer(true);
      timer.schedule(new MyTimeTask(), 0, 3000);
 
      for (int i=0;i<10;i++){
        x=i;
        try {
          Thread.sleep(8000);
        } catch (InterruptedException e) {
        }
      }
   }
}

Output:

$ java TimerExample
x: 0
x: 0
x: 0
x changed: 1
x: 1
x: 1
x: 1
x changed: 2
x: 2
x: 2
x changed: 3
x: 3
x: 3
x: 3
x changed: 4
x: 4
x: 4
x: 4
x changed: 5
x: 5
x: 5
x changed: 6
x: 6
x: 6
x: 6
x changed: 7
x: 7
x: 7
x: 7
x changed: 8
x: 8
x: 8
x changed: 9
x: 9
x: 9
x: 9