SearchEngine.java

interface SearchEngine {
    static void preparePage(WebDriver driver);
}

class DefaultSearchEngine implements SearchEngine {
    static void preparePage(WebDriver driver) {
        // do nothing
    }
}

class DuckDuckGo implements SearchEngine {
    static void preparePage(WebDriver driver) {
        WebElement adCloseButton = driver.findElement(By.id('mainAdCloseButton'));
        adCloseButton.click();
    }
}