Drag and Drop in Selenium WebDriver

We can perform Drag and Drop actions in WebDriver using Actions class. Below is the code for this:

Actions builder = new Actions(driver);
builder.dragAndDrop(source, target);

Here 'source' is the source(from element) web element and 'target' is the target(to element) web element. 

Or

/**
 * Drags the web element <code>fromWebElement</code> and drop at web element
 * <code>toWebElement</code>
 * @param fromWebElement
 * @param toWebElement
 */

public void dragAndDrop(WebElement fromWebElement, WebElement toWebElement) {

 Actions builder = new Actions(driver);
 Action dragAndDrop = builder.clickAndHold(fromWebElement)
   .moveToElement(toWebElement).release(toWebElement).build();
 dragAndDrop.perform();

}

Using robot:
/**
 * Drags the web element <code>fromWebElement</code> and drop at web element
 * <code>toWebElement</code>
 * @param fromWebElement
 * @param toWebElement
 */

public void dragAndDrop(WebElement fromWebElement, WebElement toWebElement) {

 Point coordinates1 = fromWebElement.getLocation();
 Point coordinates2 = toWebElement.getLocation();
 Robot robot = new Robot();
 robot.mouseMove(coordinates1.getX(), coordinates1.getY());
 robot.mousePress(InputEvent.BUTTON1_MASK);
 robot.mouseMove(coordinates2.getX(), coordinates2.getY());
 robot.mouseRelease(InputEvent.BUTTON1_MASK);

}