Gmail login using selenium webdriver in java

Here is the working code block to login into your Gmail account through a valid set of credentials-

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();

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Update(5-Jan-2020)

Optimizing the above code block and adding a couple of arguments you can use:

public class browserAppDemo 
{
    public static void main(String[] args) throws Exception 
    {
        System.setProperty("webdriver.chrome.driver", "C:\\Utility\\BrowserDrivers\\chromedriver.exe");
        ChromeOptions options = new ChromeOptions();
        options.addArguments("start-maximized");
        options.setExperimentalOption("useAutomationExtension", false);
        options.setExperimentalOption("excludeSwitches", Collections.singletonList("enable-automation"));
        WebDriver driver =  new ChromeDriver(options); 
        driver.get("https://accounts.google.com/signin")
        new WebDriverWait(driver, 10).until(ExpectedConditions.elementToBeClickable(By.xpath("//input[@id='identifierId']"))).sendKeys("emailID");
        driver.findElement(By.id("identifierNext")).click();
        new WebDriverWait(driver, 10).until(ExpectedConditions.elementToBeClickable(By.xpath("//input[@name="password"]"))).sendKeys("password");
        driver.findElement(By.id("passwordNext")).click();
    }
}