How to handle multiples windows if they open at different places not all together.

import java.util.Iterator;
import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;

public class Naukari {
    public static void main(String[] args) {
        WebDriver driver = new FirefoxDriver();
        driver.get("http://www.naukri.com/");
        driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
        //Click on Employer's Zone
        driver.findElement(By.xpath(".//*[@id='empNavM']/ul/li[1]/a")).click();
       
        switchControlToLatestWindow(driver); //switch control to Employer's Zone window
   
        driver.findElement(By.xpath("//div[@class='headbg']//a[text()='Report a Problem']")).click(); //click on 'Report a Problem'
        //this will again open a new window
        switchControlToLatestWindow(driver); //switch control to 'Report a Problem' window
       
        driver.findElement(By.xpath("//input[@name='strName']")).sendKeys("jdhjhgdjhgj1222"); //pass some value to Your name field to confirm our control is there
}
    //this is a method to switch the control to the latest opened window
    public static void switchControlToLatestWindow(WebDriver driver){
        Iterator<String> browsers = driver.getWindowHandles().iterator();
        while(browsers.hasNext()){
            driver.switchTo().window(browsers.next());
        }
    }

}

How to handle multiple windows.

import java.util.Iterator;
import java.util.List;
import java.util.concurrent.TimeUnit;

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

public class MultipleWindows {
    public static void main(String[] args) throws InterruptedException {
        WebDriver driver = new FirefoxDriver();
        driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
        driver.get("http://selenium-makeiteasy.blogspot.in/");
       
        WebElement ele = driver.findElement(By.xpath("//a[text()='View my complete profile']"));
        Actions act = new Actions(driver);
        act.moveToElement(ele).contextClick().sendKeys("W").perform(); //this will open the link in new window
       
        Iterator<String> addWindow = driver.getWindowHandles().iterator(); //get the address of all opened windows
        String mainPage = addWindow.next(); //get the address of main page
        String childPage = addWindow.next();//get the address of child page
       
        driver.switchTo().window(childPage); //switch the control to child window
        driver.findElement(By.xpath("//a[text()='Automate the website']")).click(); //this will click in child window's interests- Automate the website link
        Thread.sleep(5000); //simply added wait for 5sec so that one can see the how it works in new window
        driver.close(); //this will close the child window
       
        driver.switchTo().window(mainPage); //switch back to main window
        List<WebElement> pageView = driver.findElements(By.xpath("//span[@id='Stats1_totalCount']/span"));//this will give the all the WebElements of the Total Pageviews numbers
        for(WebElement num: pageView){
            System.out.print(num.getText()); //this will print the number of Total Pageviews
        }
        driver.close(); //this will close main window as well
    }
}