Selenium - Drag & Drop

import java.util.concurrent.TimeUnit;

import org.openqa.selenium.*;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.interactions.Actions;
import org.openqa.selenium.interactions.Action;

public class webdriverdemo {

   public static void main(String[] args) throws InterruptedException{
  
      WebDriver driver = new FirefoxDriver();
      //Puts a Implicit wait, Will wait for 10 seconds before throwing exception
      driver.manage().timeouts().implicitlyWait(10, TimeUnit.SECONDS);
     
      // Launch website
      driver.navigate().to("http://www.keenthemes.com/preview/metronic/templates/admin/ui_tree.html");
      driver.manage().window().maximize();
     
      WebElement From = driver.findElement(By.xpath(".//*[@id='j3_7']/a"));
      WebElement To = driver.findElement(By.xpath(".//*[@id='j3_1']/a"));
     
      Actions builder = new Actions(driver);
      Action dragAndDrop = builder.clickAndHold(From).moveToElement(To).release(To).build();
     
      dragAndDrop.perform();
      driver.close();
      }
   }