Window Handles in Selenium

Different ways to handle Window Handles in Selenium 

public class SwitchToWindow {
    public static void main(String[] args) {
    WebDriver driver;
    System.setProperty("webdriver.chrome.driver", "F:\\chromedriver\\chromedriver_latest\\chromedriver.exe");
    driver = new ChromeDriver();
    driver.manage().window().maximize();
    String parent=driver.getWindowHandle();
    Set<String> handles=driver.getWindowHandles();
    String windows;
    Iterator<String> I=handles.iterator();
    while (I.hasNext()){
    String childwindow= I.next();
    if(driver.switchTo().window(childwindow).getTitle().equalsIgnoreCase("window title")||driver.switchTo().window(childwindow).getCurrentUrl().contains("url")){
    driver.switchTo().window(childwindow);
  }
}

    for (String cw:handles)
    {
        if(driver.switchTo().window(cw).getTitle().contains("title")){
            driver.switchTo().window(cw);
        }
    
    }

    // Switch to specific window using index

    ArrayList<String> allwindows=new ArrayList<>(driver.getWindowHandles());
    int noofwindows=allwindows.size();
    driver.switchTo().window(allwindows.get(2));
    for (String winds:allwindows) {
        if(driver.switchTo().window(winds).getTitle().contains("title")){
            driver.switchTo().window(winds);
        }
    }

    //Do actions in that window        driver.close();
    driver.switchTo().window(parent);
  }
}

Please comment below to feedback or ask questions.