How to generate unique file names

Mode one

Generate a five digit random number plus the month, day, minute and second of the current time

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

public class MyUtil {
    
    public static void main(String[] args) {
    
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyyMMddHHmmss");
        Random random = new Random();
        String unique = random.nextInt(89999 + 10000) + simpleDateFormat.format(new Date());
        System.out.println(unique);
    }
}