Selenium does not have a method for scrolling
but there are some ways to scroll:
#1 ->=moveToElement= coming from Actions class
   will scroll down and up to given web element
#2 Using JSExecutor: We can inject JavaScript
   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.
WebDriver driver = new ChromeDriver(); 
JavascriptExecutor jse = (JavascriptExecutor)driver;
jse.executeScript("scroll(0, 250);"); Scroll Down
jse.executeScript("scroll(0,-250);"); Scroll Up

I can either scroll down a page by using window.scrollBy() function
from java script
Example:
((JavascriptExecutor) driver).executeScript("window.scrollBy(0,500)");

Or I use Action class:

Actions actions = new Actions(driver); 
	actions.sendKeys(Keys.ARROW_UP)	 	 
           .sendKeys(Keys.ARROW_DOWN) 	 	
           .sendKeys(Keys.PAGE_DOWN) —> to scroll down 	 	 
           .sendKeys(Keys.PAGE_UP)   —> to scroll up