java - Comparing two Lists of same type of Objects -


assume have 2 lists, listold contains old employee information, listnew contains new employee information

employee {    long lastupdate; }  list<employee> listold; //arraylist list<employee> listnew;

how compare both lists , return new list contains, list of new employees added, new list contains, list of employees removed, new list contains employees lastupdate has changed?

i think of iterating on lists , comparing, end o(n2) time , done util class , more efficiently?

apache's commons.collections library has collectionutils class. class provides methods collection checking, including intersection, difference, , union.

see: http://commons.apache.org/proper/commons-collections/javadocs/api-3.2.1/index.html


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