Example selenium webdriver code to enter values in textfield/textbox using java

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.ie.InternetExplorerDriver;

public class Test {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
WebDriver driver = new FirefoxDriver(); // launch the firefox browser
driver.get("http://www.google.com"); //Navigate to google.com
driver.findElement(By.name("q")).sendKeys("test"); // enter 'test' value in google search textbox

}

}