How to do Page Scroll Using JavascriptExecutor?

package seleniumwebdriverbestpractices;

import java.util.concurrent.TimeUnit;

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

public class ScrollPage {

WebDriver driver;

@Test
public void scrollingPageTest() throws Throwable{
System.setProperty("webdriver.chrome.driver", System.getProperty("user.dir")+"\\drivers\\chromedriver.exe");
driver = new ChromeDriver();
driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
// driver.get("https://www.spicejet.com/");
driver.get("https://www.w3schools.com/");
driver.manage().window().maximize();


JavascriptExecutor js = (JavascriptExecutor)driver;

// Scroll Down
js.executeScript("window.scrollBy(0,1000)", "");
Thread.sleep(5000);

// Scroll Up
js.executeScript("window.scrollBy(0,-500)", "");
Thread.sleep(5000);

// Scroll to an element
WebElement element = driver.findElement(By.xpath("//div[@id='main']//a[text()='HTML Exercises']"));
js.executeScript("arguments[0].scrollIntoView(true);", element);
Thread.sleep(5000);

// Scroll to the bottom of the page
js.executeScript("window.scrollBy(0,document.body.scrollHeight)","");
Thread.sleep(5000);

driver.quit();

}

}

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