How to open specific browser using selenium webdriver

Question

I am using lang :java framework: testNG

my system has 3-4 versions of Mozilla installed, how can i open instance of specific version of Mozilla. Suppose i have 3.5, 3.6,

Answer 1

For firefox

 System.setProperty("webdriver.gecko.driver","path of geckodriver.exe");
 WebDriver driver = new FirefoxDriver();

Fro Chrome browser

     File file = new File("D:\\selnium webdriver\\driver\\chromedriver.exe");
     System.setProperty("webdriver.chrome.driver", file.getAbsolutePath() );
      WebDriver driver = new ChromeDriver();

For Internet explorer

           File file = new File("D:\\selnium webdriver\\driver\\IEDriverServer.exe");
    System.setProperty("webdriver.ie.driver", file.getAbsolutePath());
       WebDriver driver = new InternetExplorerDriver();