Java Compare Two Lists

Question

I have two lists ( not java lists, you can say two columns)

For example

**List 1**            **Lists 2**
  milan                 hafil
  dingo               


        

Answer 1

Of all the approaches, I find using org.apache.commons.collections.CollectionUtils#isEqualCollection is the best approach. Here are the reasons -

• I don't have to declare any additional list/set myself
• I am not mutating the input lists
• It's very efficient. It checks the equality in O(N) complexity.

If it's not possible to have apache.commons.collections as a dependency, I would recommend to implement the algorithm it follows to check equality of the list because of it's efficiency.