Example selenium webdriver code to click button/link/any kind of element using java

Example 1: 

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;

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"); // send 'test' value in google search textbox
driver.findElement(By.name("btnG")).click(); // click on google search button

}

}

Example 2: Using mouse action class in selenium

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.interactions.Actions;

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"); // send 'test' value in google search textbox
Actions action = new Actions(driver);
  action.click(driver.findElement(By.name("btnG"))).build().perform(); // click on google search button

}

}

Example 3: Using JavascriptExecutor class in selenium

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.JavascriptExecutor;

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"); // send 'test' value in google search textbox
JavascriptExecutor executor = (JavascriptExecutor)driver;
executor.executeScript("arguments[0].click();", driver.findElement(By.name("btnG"))); // click on google search button

}

}