How to count the number of options in a select dropdown box in selenium

Count the number of elements in a dropdown list using Selenium

Steps:
1.Open web browser
2.Get the element of the dropdown list
3.Get the list elements using above webelement
4.Get the size of the list using size() method

import java.util.List;
import java.util.Set;

import org.junit.Test;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;

public class CountNumberOfValues {
 @Test
 public void numberOfElementsDropDown() throws InterruptedException {
  WebDriver driver = new FirefoxDriver();
  driver.get("http://www.monsterindia.com/");
  Thread.sleep(4000);
  String parentWindow = driver.getWindowHandle();
  Set<String> windows = driver.getWindowHandles();
  for(String window : windows) {
    if(!parentWindow.equals(window)) {
      driver.switchTo().window(window);
      driver.close();
    }
  }
  driver.switchTo().window(parentWindow);
  Thread.sleep(3000);
  driver.findElement(By.id("selExp_id")).click();
  WebElement element = driver.findElement(By.cssSelector(".single_select"));
  List<WebElement> elements = element.findElements(By.cssSelector(".option_item"));
  int numberOfValues = elements.size();
  System.out.println("The number of elements in the dropdown list "+numberOfValues);
  driver.quit();
 }

}

Ouput:

The number of elements in the dropdown list 52