How to handle multiple windows in Selenium WebDriver and switch to the required window

import java.util.Set;

package SeleniumPractise;

import java.util.Set;

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

public class ActionsAndWindows {

 @Test
 public void newWindows() throws InterruptedException {
  WebDriver driver = new FirefoxDriver();
  driver.get("http://docs.seleniumhq.org/");
  driver.manage().window().maximize();
  System.out.println(driver.getTitle());
  System.out.println(driver.getCurrentUrl());
  Thread.sleep(3000);
  WebElement element1 = driver.findElement(By.cssSelector("#menu_documentation a"));
  Actions action1 = new Actions(driver);
  action1.contextClick(element1).build().perform();
  action1.sendKeys(Keys.ARROW_DOWN).build().perform();
  action1.sendKeys(Keys.ARROW_DOWN).build().perform();
  Thread.sleep(2000);
  action1.sendKeys(Keys.ENTER).build().perform();
  Thread.sleep(2000);
  WebElement element2 = driver.findElement(By.cssSelector("#menu_projects a"));
  Actions action2 = new Actions(driver);
  action2.contextClick(element2).build().perform();
  action2.sendKeys(Keys.ARROW_DOWN).build().perform();
  action2.sendKeys(Keys.ARROW_DOWN).build().perform();
  Thread.sleep(2000);
  action2.sendKeys(Keys.ENTER).build().perform();
  Thread.sleep(2000);
  WebElement element3 = driver.findElement(By.cssSelector("#menu_support a"));
  Actions action3 = new Actions(driver);
  action3.contextClick(element3).build().perform();
  action3.sendKeys(Keys.ARROW_DOWN).build().perform();
  action3.sendKeys(Keys.ARROW_DOWN).build().perform();
  Thread.sleep(2000);
  action3.sendKeys(Keys.ENTER).build().perform();
  Thread.sleep(2000);
  Set<String> windows = driver.getWindowHandles();
  System.out.println("Number of windows " + windows.size());
  String neededWindow = "Selenium Projects";
  for (String window : windows) {
   WebDriver requiredWindow = driver.switchTo().window(window);
   System.out.println(requiredWindow.getTitle());
   if (requiredWindow.getTitle().equals(neededWindow)) {
    System.out.println(requiredWindow.getTitle());
    break;
   }
  }
  driver.findElement(By.linkText("Selenium WebDriver")).click();
  Thread.sleep(3000);

   driver.close(); // Closes the current browser

   Thread.sleep(3000);
  driver.quit();
 }
}

Output:

Selenium - Web Browser Automation

http://docs.seleniumhq.org/

Number of windows 4

Selenium - Web Browser Automation

Selenium Documentation — Selenium Documentation

Selenium Projects

Selenium Projects