ServiveOffice, Utils class

package ServicePkg;

import java.util.Date;
import java.util.Random;

public class Utils {
    public static final int minServiceTime = 300;
    public static final int maxServiceTime = 600;

    public static final int minTimeToNextCustomer = 100;
    public static final int maxTimeToNextCustomer = 200;

    private static Random rnd = new Random();

    public static void printLog(String logMessage) {
        System.out.println((new Date()).getTime() + " : " + logMessage);
    }

    public static int getRandomServiceTime() {
        return minServiceTime
                + rnd.nextInt(maxServiceTime - minServiceTime + 1);
    }

    public static int getRandomTimeToNextCustomer() {
        return minTimeToNextCustomer
                + rnd.nextInt(maxTimeToNextCustomer - minTimeToNextCustomer + 1);
    }
}