Launching Broswer using different methods

we can launch the browser by following ways:

• Using default selenium object.
• Using webdriver object.
• Using HTTPCommandProcesser object.
• Using WebDriver backed Selenium object.

By default selenium object:

    browser=new DefaultSelenium("localhost",4444, "firefox","http://www.google.com");
    browser.start();
    browser.windowMaximize();
    browser.open("http://www.google.com");

By Webdriver Object:
  
    WebDriver browser1;
    browser1=new FirefoxDriver();
    browser1.get("http://www.google.com");

By HTTPCommandProcesser object:

    HttpCommandProcessor browser2;
    browser2= new HttpCommandProcessor("localhost", 4444, "*firefox", "http://www.google.com");
    browser2.start();
    String[] url={"http://www.google.com"};
    browser2.doCommand("open", url);
  
By WebDriver backed Selenium object:
  
    browser1=new FirefoxDriver();
    browser=new WebDriverBackedSelenium(browser1,"http://www.google.com");
    browser.open("http://www.google.com");
    browser.windowMaximize();