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

import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;

import org.openqa.selenium.WebDriver;

import org.openqa.selenium.WebElement;

import org.openqa.selenium.firefox.FirefoxDriver;

import org.openqa.selenium.support.ui.ExpectedConditions;

import org.openqa.selenium.support.ui.WebDriverWait;


public class GmailDemo {

 public static void main(String[] args) {

 WebDriver driver = new FirefoxDriver();

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

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

 driver.get(url);

 driver.findElement(By.id("identifierId")).sendKeys("raj8805"); 

 //driver.manage().timeouts().implicitlyWait(20, TimeUnit.SECONDS); 

 WebDriverWait wait=new WebDriverWait(driver, 20); 

 driver.findElement(By.xpath("//span[@class='RveJvd snByac']")).click(); 

 driver.manage().timeouts().implicitlyWait(50, TimeUnit.SECONDS); 

 driver.findElement(By.xpath("//input[@class='whsOnd zHQkBf']")).sendKeys("asassassa"); 

 driver.findElement(By.xpath("//span[@class='RveJvd snByac']")).click(); 

 } 

}

The problem is that, after mail id page, my password is getting written in the id box option & the server redirects to next password page. I want to ask, what should I do so that my password would be entered only in password page?