We can also verify the elements are available or not on a web page in below ways:
Boolean isElementPresent;
Verification:1
WebDriver driver = new FirefoxDriver();
isElementPresent = driver.findElements(By.id("your_element_id")).size() > 0
Verification:2
try
{
driver.findElement(By.id("your_element_id"));
isElementPresent = true;
}
catch (NoSuchElementException e) {
isElementPresent = false;
}