Create Automation Script for Amazon Category,Subcatgeory and checkbox filter

package basicexample;
import java.util.List;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;
public class AmazonTabletTask {
public static void main(String[] args) throws InterruptedException {
System.setProperty("webdriver.chrome.driver", "C://chromedriver.exe");
WebDriver driver = new ChromeDriver();
driver.manage().window().maximize();
// Open Amazon
driver.get("https://www.amazon.in/");
// Click on Hamburger menu
driver.findElement(By.id("nav-hamburger-menu")).click();
Thread.sleep(2000);
// Click on Mobile, Computer menu
driver.findElement(By.xpath("//a[@data-menu-id='7']")).click();
Thread.sleep(2000);
// Click on Tablets
driver.findElement(By.xpath("//a/div[contains(text(),'Tablets')]")).click();
Thread.sleep(2000);
// Click on 16 GB CheckBox
driver.findElement(By.name("s-ref-checkbox-8561113031")).click();
Thread.sleep(2000);
List<WebElement> priceList16Gb=driver.findElements(By.xpath("//span[@class='a-price-whole']"));
String beforeComma, afterComma;
  int finalVal, max=0;
      for(int i=0;i<priceList16Gb.size();i++)
      {
      String value = priceList16Gb.get(i).getText();
      if(value!="")
      {
      if(value.indexOf(",")!=-1)
      {
       beforeComma = value.substring(0,value.indexOf(","));
       afterComma = value.substring(value.indexOf(",")+1);
       finalVal = Integer.parseInt(beforeComma+afterComma);
       System.out.println(finalVal);
       if(max<finalVal)
       {
        max=finalVal;
       }
      }
     }
   }
      System.out.println("Maximum price for 16 GB := "+max);

      // UnCheck 16 GB CheckBox
      Thread.sleep(6000);
      driver.navigate().back();   
      driver.findElement(By.name("s-ref-checkbox-8561114031")).click();
   
      List<WebElement> priceList32Gb=driver.findElements(By.xpath("//span[@class='a-price-whole']"));
beforeComma="";
afterComma="";
finalVal=0;
max=0;
      for(int i=0;i<priceList32Gb.size();i++)
      {
      String value = priceList32Gb.get(i).getText();
      if(value!="")
      {
      if(value.indexOf(",")!=-1)
      {
       beforeComma = value.substring(0,value.indexOf(","));
       afterComma = value.substring(value.indexOf(",")+1);
       finalVal = Integer.parseInt(beforeComma+afterComma);
       System.out.println(finalVal);
       if(max<finalVal)
       {
        max=finalVal;
       }
      }
     }
   }
      System.out.println("Maximum price for 32 GB := "+max);
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Close Test
driver.close();
}
}