스트림

ex.java

private static void afterImprovement(List<WebElement> elements)
    {
        elements.stream()
                .map(WebElement::getText)
                .distinct()
                .filter(s -> s.length() > 0)
                .forEach(System.out::println);
    }

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private static void beforeImprovement(List<WebElement> elements)
    {
        Set<String> set = new HashSet<>();
        for (WebElement element: elements)
        {
            String category = element.getText();
            if (category.length() > 0)
            {
                set.add(category);
                System.out.println(category);
                System.out.println(category.getClass().getName());
            }
        }
    }