JSF: How to sort the dropdown list before displaying in dropdown box : [This is drop down list][1]


The below image will show the code for that drop down box. It will return a list of object, after that I'm creating new SelectItem object. Is there any way to sort the list of object before I'm creating new SelectItem object.

[Java Code for Drop Down box[2]



Sorry, I'm not able to send the entire code, due to confidential 
  [1]: https://i.stack.imgur.com/xo6Du.png
  [2]: https://i.stack.imgur.com/Y9L0W.png