how to scroll in selenium

 Selenium does not have a dedicated method specifically for scrolling 
 in the page but there are some ways to scroll for example =
 
   #1 ->=moveToElement= coming from Actions class will scroll down and up to 
   given web element
   Scrolling using JSExecutor: We can inject JavaScrip code in our Java+Selenium 
   code using JSExecutor which helps us scroll up, down, left, right.
   We need to create instance of JS executor, then cast our driver type of it.
   JavaScriptExecutor js = (JavaScriptExecutor) Driver.getDriver();
   js.executeScript("in here we need to pass js code that scrolls");
    
    syntax is =
    #2- js.executeScript("window.scrollBy(0,250)");
    #3- js.executeScript("arguments[0].scrollIntoView(true);", WebElement);

import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.testng.annotations.Test;

public class ScrollByPixel {

    WebDriver driver;
    @Test
    public void ByPixel() {
        System.setProperty("webdriver.chrome.driver", "E://Selenium//Selenium_Jars//chromedriver.exe");
        driver = new ChromeDriver();

        JavascriptExecutor js = (JavascriptExecutor) driver;

        // Launch the application		
        driver.get("http://demo.guru99.com/test/guru99home/");

        //To maximize the window. This code may not work with Selenium 3 jars. If script fails you can remove the line below		
        driver.manage().window().maximize();

        // This  will scroll down the page by  1000 pixel vertical		
        js.executeScript("window.scrollBy(0,1000)");
    }
}