How to automate gmail login process using selenium webdriver in java?

System.setProperty("webdriver.gecko.driver","C:\\your_directory\\geckodriver.exe");

    WebDriver driver = new FirefoxDriver();

    driver.manage().window().maximize();

    String url = "https://accounts.google.com/signin";

    driver.get(url);

    driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS); 

    WebElement email_phone = driver.findElement(By.xpath("//input[@id='identifierId']"));

    email_phone.sendKeys("your_email_phone");

    driver.findElement(By.id("identifierNext")).click();

    WebElement password = driver.findElement(By.xpath("//input[@name='password']"));

    WebDriverWait wait = new WebDriverWait(driver, 20);

    wait.until(ExpectedConditions.elementToBeClickable(password));

    password.sendKeys("your_password");

    driver.findElement(By.id("passwordNext")).click();