How would I set this small program to activate every 120 seconds?

Question

I have this small program that writes the value 0 to a file, but I want it to only activate every 120 seconds, so it doesn't take up a bunch of system resources by constantly running. Can I make it pause for 120 seconds, or set a timer for it, in such a way that it won't make my PC run slow? Here's my code. Thanks if you can help.
import java.util.*;
import java.io.*;
import java.io.File;
public class Purge extends Random implements Serializable {
     public Purge () {
          writePrimDoubles();
     public static void main (String [] args) {
          Purge test = new Purge();
     public void writePrimDoubles() {
          DataOutputStream outStream;
          long timerStart;
          long timerEnd;
          long size;
          int a = 1;
          try     {          
               while (a==1) {
                    outStream = new DataOutputStream
                         (new FileOutputStream("packetlog.txt"));
                    timerStart = System.currentTimeMillis();
                    outStream.writeBytes("0");
                    timerEnd = System.currentTimeMillis();
                    outStream.close();
          catch(IOException e) {
               System.out.println("Error writing to file");
}

Answer 1

java.util.Timer, I think may do the trick.