How to check whether list is dropdown list or multiple select list

Webdriver driver=new FirefoxDriver();

driver.get("https://www.facebook.com/");

WebElement ele=driver.findElement(By.id("month"));

Select sel=new Select(ele);

if(sel.isMultiple()){

System.out.print("it is multiselect list box");

}

else{

System.out.print("it is dropdown box");

}

Output:it is dropdown box