Selenium:Frame basic example in selenium web driver

package frameexamples;

import java.util.List;
import java.util.concurrent.TimeUnit;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

public class AutoComplete {

    WebDriver driver;
      @Test
      public void frameOperation() throws InterruptedException {
          driver.navigate().to("http://jqueryui.com/");
          driver.findElement(By.linkText("Autocomplete")).click();
          List<WebElement> l=driver.findElements(By.tagName("iframe"));
          for (WebElement webElement : l) {
            System.out.println(webElement.getText());
        }
          driver.switchTo().frame(0);
          driver.findElement(By.xpath(".//*[@id='tags']")).sendKeys("java");
          Thread.sleep(5000);
          //switch back to default content
          driver.switchTo().defaultContent();
          driver.findElement(By.xpath(".//*[text()='Accordion']")).click();
       
        /*  //index
         // driver.switchTo().frame(0);
          //id or Name
          //in this example Frame is not having ID or Name so this is invalid here
          //driver.switchTo().frame("nameorid");
          //frameElement
          driver.switchTo().frame(driver.findElement(By.className("demo-frame")));
          //type in text box..
          driver.findElement(By.id("tags")).sendKeys("java");
         
          Thread.sleep(5000);
          //switch back to default content
          driver.switchTo().defaultContent();
          driver.findElement(By.linkText("Accordion")).click();*/
          Thread.sleep(5000);
      }
      @BeforeClass
      public void beforeClass() {
          System.setProperty("webdriver.firefox.bin",
                    "C:\\Users\\RAMESH\\AppData\\Local\\Mozilla Firefox\\firefox.exe");
          driver=new FirefoxDriver();
          driver.manage().window().maximize();
          driver.manage().timeouts().implicitlyWait(30,TimeUnit.SECONDS);
         
      }

      @AfterClass
      public void afterClass() {
          driver.quit();
      }
   
}