Webdriver how to verify element is not displayed in Java.

This code snippet can be used when there is a hard coded element.

// WebElement first search result link can be captured using search_results_scroll.
boolean isDiplayedKnowledgeBase=false;
WebCommand.pause(6000);
try{
    WebElement firstSearchResult = search_results_scroll.findElement(By.cssSelector("ul > li"));
    isDiplayedKnowledgeBase=firstSearchResult.isDisplayed();
}
catch(NoSuchElementException e){
    System.out.println("Unwanted element is not displayed.");
}
Assert.assertEquals(false, isDiplayedKnowledgeBase,"This facility  is listed for unwanted users.");

If the element is passed form page object model can use below code snippet.

Pass the element from the page Object

elementNotPresentVerification(gatewayLandingPage.lbl_WhatNeedTohappenWithThis);
public void elementNotPresentVerification(WebElement element) {
    try {
        Assert.assertEquals(false, element.isDisplayed(), "Unwanted element is displayed " + element);
    } catch (NoSuchElementException e) {
        System.out.println("Unwanted element is not found");
    }
}