What are the Locating Techniques dynamic XPATH patterns / Ma

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;


public class DynamicXpath {

	public static void main(String[] args) throws InterruptedException {
		WebDriver myTestDriver = new FirefoxDriver();
		myTestDriver.get("http://tinyurl.com/cn5pum8");
		myTestDriver.manage().window().maximize();
		myTestDriver.manage().timeouts().implicitlyWait(10,TimeUnit.SECONDS);

		List<WebElement> RadioNamelist = myTestDriver
				.findElements(By
				.xpath("//input[contains(@id,'-real')]"));

		System.out.println(RadioNamelist.size());

		for(int i=0;i<RadioNamelist.size();i++){
			System.out.println(RadioNamelist.get(i).getAttribute("name"));
		}


		myTestDriver.quit();
	}




}