Check your grades for parent portal

GradeChecker.java

package me.tarunb.gradechecker;

import org.openqa.selenium.By;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.phantomjs.PhantomJSDriver;
import org.openqa.selenium.support.ui.ExpectedConditions;
import org.openqa.selenium.support.ui.WebDriverWait;

import java.io.File;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.List;

public class Main {

    public static void main(String[] args) {

        // ignore stupid error messages
        try {
            File errFile = new File("err.out");
            System.setErr(new PrintStream(errFile));
            errFile.deleteOnExit();
        } catch (Exception e) {
            e.printStackTrace();
        }

        List<String> classNames = new ArrayList<>();
        List<Double> grades = new ArrayList<>();

        System.out.println("Fetching grades...");
        long start = System.currentTimeMillis();

        PhantomJSDriver driver = new PhantomJSDriver();
        driver.get("https://parents.edison.k12.nj.us/genesis/parents?gohome=true");

        driver.findElementById("j_username").sendKeys("YOUR_EMAIL_HERE");
        driver.findElementById("j_password").sendKeys("YOUR_PASSWORD_HERE");
        driver.findElementByClassName("saveButton").click();

        WebDriverWait gradeWait = new WebDriverWait(driver, 3);
        gradeWait.until(ExpectedConditions.presenceOfElementLocated(By.className("list")));

        List<WebElement> classElems = driver.findElementsByClassName("categorytab");
        classElems.forEach(elem -> classNames.add(elem.findElement(By.tagName("u")).getText()));

        List<WebElement> gradeElems = driver.findElements(By.cssSelector(".cellRight[width=\"70%\"]"));
        gradeElems.forEach(elem -> grades.add(Double.parseDouble(elem.getText().replace("%", ""))));

        long end = System.currentTimeMillis();
        System.out.println("Fetched grades in " + ((end - start) / 1000.0) + " seconds:");

        int longestClassNameLength = classNames.stream().map(String::length).sorted((o1, o2) -> o2 - o1).findFirst().get();

        for (int i = 0; i < classNames.size(); i++) {
            double currentGrade = grades.get(i);
            System.out.printf("%-" + longestClassNameLength + "s : %6.2f (%s)\n", classNames.get(i), currentGrade, getLetterGrade(currentGrade));
        }

        driver.quit();
    }

    private static String getLetterGrade(double num) {
        if (num >= 96.5) {
            return "A+";
        } else if (num >= 92.5) {
            return "A";
        } else if (num >= 89.5) {
            return "A-";
        } else if (num >= 86.5) {
            return "B+";
        } else if (num >= 82.5) {
            return "B";
        } else if (num >= 79.5) {
            return "B-";
        } else if (num >= 76.5) {
            return "C+";
        } else if (num >= 72.5) {
            return "C";
        } else if (num >= 69.5) {
            return "C-";
        } else {
            return "you're doing really bad";
        }
    }

}