One alternative for https://stackoverflow.com/q/53989644/679824

SorterSample.java

import java.util.List;
import org.openqa.selenium.By;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.interactions.Actions;
import org.openqa.selenium.remote.RemoteWebDriver;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

public class SorterSample {
  private RemoteWebDriver driver;

  @BeforeClass
  public void setup() {
    driver = new ChromeDriver();
  }

  @AfterClass
  public void cleanup() {
    if (driver != null) {
      driver.quit();
    }
  }

  @Test
  public void testMethod() {
    String url = "http://jqueryui.com/sortable/";
    driver.get(url);
    driver.switchTo().frame(driver.findElement(By.cssSelector("iframe.demo-frame")));
    List<WebElement> items = driver.findElements(By.cssSelector("#sortable > li"));
    items.sort(
        (o1, o2) -> {
          int compareValue = o1.getText().compareTo(o2.getText());
          if (compareValue < 0) {
            new Actions(driver).dragAndDrop(o1, o2).perform();
          }
          return compareValue;
        });
  }
}