Selenium Support Multiple Browsers

getWebdriverMethod.java

/*Embed this method in your test class*/  
private WebDriver getWebdriver(String browser){
	  WebDriver driver = null;
	  // If the browser is Firefox, then do this
	  if(browser.equalsIgnoreCase("firefox")) {
		  System.setProperty("webdriver.gecko.driver", "drivers\\geckodriver.exe");
		  driver = new FirefoxDriver();
	 	  // If browser is IE, then do this	  
	  } else if (browser.equalsIgnoreCase("chrome")){
		  System.setProperty("webdriver.chrome.driver", "drivers\\chromedriver.exe");
		  driver = new ChromeDriver();
	  } else if (browser.equalsIgnoreCase("ie")) { 
	 	  // Here I am setting up the path for my IEDriver
	 	  System.setProperty("webdriver.ie.driver", "drivers\\IEDriverServer.exe");
	 	  driver = new InternetExplorerDriver();
	  }
	  return driver;
  }

testng.xml

<?xml version="1.0" encoding="UTF-8"?>
<suite name="Suite" parallel="none">
  <!-- Test Suite Level Parameters -->
  <parameter name="baseUrl" value="http://swapnilshrikhande.github.io/" />

  <test name="FireFoxTest">
  		<!-- Test Level Parameters -->
    	<parameter name="browser" value="firefox" />
	    <classes>
	      <class name="com.eternussolutions.<ClassName>"/>
	    </classes>
  </test>
  
  <test name="ChromeTest">
	  	<!-- Test Level Parameters -->
    	<parameter name="browser" value="chrome" />
	    <classes>
	      <class name="com.eternussolutions.<ClassName>"/>
	    </classes>
  </test>
  
  <test name="IETest">
	  	<!-- Test Level Parameters -->
    	<parameter name="browser" value="ie" />
	    <classes>
	      <class name="com.eternussolutions.<ClassName>"/>
	    </classes>
  </test>
  
  <!-- Test -->
</suite> <!-- Suite -->

updateTestClass.java

//Update setUp method to accept browser name as parameter  
/*Testng will pass browser value as a parameter to this method*/
  @Parameters("browser")
  @BeforeClass(alwaysRun = true)
  public void setUp(String browser) throws Exception {
	//other code ...
    //initialize driver using getWebdriver method
    driver  = getWebdriver(browser);
    //other code ...
  }