Can I sort an ArrayList basd on a data member?

Hello everyone.
Currently my program stores a lot of objects in an ArrayList.
Each of these objects has the following data members:
public class ClassEntity
     //RODM ID VERSION
     private String idClassName;
     private String idFieldName;
     //ENGLISH VERSION
     private String englishClassName;
     private String englishFieldName;
     private String fieldType;
}I have the following data structure:
List<ClassEntity> classEntityList = new ArrayList<ClassEntity>();Now is there a way to order the Objects inside the ArrayList so they are in alphabetical order based on the englishFieldName data member?
I currently iterate through the List and write it to a file and the List is out of order so the writing to file is out of order.
I saw collections has a .sort() method, but I'm not sure how I would tell the .sort() to sort based on englishFieldName. In C++ I would overload the < operator I'm still new to data structures in Java though.
Thanks!

Implement the Comparable Interface in your class, as my example in this posting shows:
http://forum.java.sun.com/thread.jspa?forumID=31&threadID=598401

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Can I sort an ArrayList basd on a data member?

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