How to Click Random Links Of A Web Page Using Java Selenium Program?

How to Click Random Links on a Web Page Using Java Selenium Program?

package com.selenium.mix;
import java.util.List;
import java.util.Random;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;
public class ClicksLinksRandomly 
{
   public static void main(String[] args) throws InterruptedException 
   {
      // TODO Auto-generated method stub
      WebDriver obj=new FirefoxDriver();
      obj.get("http://www.bbc.com/");
      Thread.sleep(5000);
      WebElement Boxarea = obj.findElement(By.xpath(".//*[@id='page']/section[6]/div/div/div[2]"));
      List<WebElement> l1 = Boxarea.findElements(By.tagName("a"));
      System.out.println("The Number Of Anchor Text" + l1.size());
      for (int i=0; i<l1.size(); i++)
      {
         Random r=new Random();
         l1.get(r.nextInt(5)).click();
         String ptitle=obj.getTitle();
         System.out.println("The Page Title is :" + ptitle);
         Thread.sleep(5000);
         obj.get("http://www.bbc.com/");
         Thread.sleep(5000);
         Boxarea = obj.findElement(By.xpath(".//*[@id='page']/section[6]/div/div/div[2]"));
         l1 = Boxarea.findElements(By.tagName("a"));	
      }
   }
}