RozetkaScraper is written in Java using Selenium. Not fully worked

RozetkaScraper.java

import org.openqa.selenium.By;
import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import product.Product;
import product.category.Category;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by tkaczenko on 25.12.16.
 */
public class RozetkaScraper {
    private static final String ROZETKA =
            "http://rozetka.com.ua/sportivnoe-pitanie/c273292/?gclid=CIS4zIDJkdECFUktGQodo7kCdA";

    private static int NUM_OF_PAGES = 100 / 31;

    private static WebDriver driver;

    static {
        System.setProperty("webdriver.gecko.driver", "/home/tkaczenko/Desktop/geckodriver");
        driver = new FirefoxDriver();
    }

    // Data
    private List<Category> categories = new ArrayList<>();
    private List<Product> products = new ArrayList<>();

    private List<String> urls = new ArrayList<>();

    public void parseCategory() {
        driver.get(ROZETKA);

        List<WebElement> titles = driver.findElements(By.cssSelector("a.pab-h3-link"));
        for (WebElement element : titles) {
            Category category = new Category(element.getText(), "");
            System.out.println("\t - " + category.getName());
            String url = element.getAttribute("href");
            urls.add(url);
            for (int i = 2; i <= NUM_OF_PAGES; i++) {
                urls.add(url + "/page=" + i + "/");
            }
        }
        parseProducts();
    }

    public void parseProducts() {
        List<String> temp = new ArrayList<>();
        for (String url : urls) {
            driver.get(url);
            ((JavascriptExecutor) driver).executeScript("scroll(0, 300)");
            List<WebElement> names = driver.findElements(By.xpath("//div[contains(@class, " +
                    "'g-i-tile-i-title clearfix')]"));
            List<WebElement> prices = driver.findElements(By.xpath("//div[contains(@class, " +
                    "'g-price-uah')]"));
            /*WebDriverWait wait = new WebDriverWait(driver, 20);
            wait.until(ExpectedConditions.visibilityOfAllElements(driver.findElements(By.tagName("img"))));*/
            List<WebElement> images = driver.findElements(By.tagName("img"));
            for (int i = 0; i < images.size(); i++) {
                System.out.println(i + " " + images.get(i).getAttribute("src"));
            }
            /*for (int i = 0; i < names.size(); i++) {
                System.out.println(i + "\t" + names.get(i).getText() + prices.get(i).getText());
                Iterator<WebElement> iterator = images.iterator();
                while (iterator.hasNext()) {
                    WebElement element = iterator.next();
                    String title = element.getAttribute("title");
                    if (title.contains(names.get(i).getText())) {
                        System.out.println(element.getAttribute("src"));
                        break;
                    }
                }
                temp.add(names.get(i).getAttribute("href"));
            }*/
        }
        urls.clear();
        urls = temp;
    }

    public void parseProduct() {
        for (String url : urls) {
            driver.get(url);
            //// TODO: 26.12.16 Implement
        }
    }
}