Count no of options present in listbox

WebDriver driver=new FirefoxDriver();

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

WebElement Day=driver.findElement(By.id("day");

Select sel=new Select(box);

List<WebElement>list=sel.getOption();

System.out.println(list);

for(int i=0;i<list.size();i++){

System.our.println(list.size());

}

}