How to click on button on Popup Window in Selenium Webdriver by using Java

Question

Please Help me how to click on button on Popup Window in Selenium Webdriver by using Java, i have apply more and more code but i am not success, please help me . I have also attached Please see a lock and give me reply my answer please|||||

Answer 1

Finally i got it answer

    driver.findElement(By.xpath("/html/body/div[1]/div[1]/div/div[4]/div[2]/div[2]/div[2]/div[1]/div/div[3]/div[1]/div/a[15]/div/img")).click();
    Set<String> RecipeHandle = driver.getWindowHandles();
     System.out.println(RecipeHandle);  
     for (String handle1 : driver.getWindowHandles()) 
     {
            System.out.println(handle1);
            driver.switchTo().window(handle1);              
     }
     driver.findElement(By.xpath("/html/body/div[1]/div[1]/div/div[4]/div[2]/div/div/div[2]/div[1]/div/div[2]/div[1]/a[4]")).click();
    driver.findElement(By.xpath("/html/body/div[1]/div[1]/div/div[4]/div[2]/div/div/div[2]/div[1]/div/div[2]/div[1]/div[3]/div/div/div[2]/button")).click();
    driver.switchTo().window(handle);
    driver.manage().timeouts().implicitlyWait(5000, TimeUnit.SECONDS);
    Thread.sleep(3000);**

Thanks for erveryone who responding me...