Order an ArrayList of Set of String [closed]

Question

I have an ArrayList of Set of String in Java

List<Set< String >> combinations;

What is the best way to order the ArrayList based on the size of the Set in an ascending order?

Ascending order of what? Which should come first: {A, D} or {B, C}? — Jon Skeet
– Jon Skeet, Commented Dec 24, 2012 at 15:45
See stackoverflow.com/questions/2477261/how-to-sort-a-collectiont — irrelephant
– irrelephant, Commented Dec 24, 2012 at 15:50

Patricia Shanahan · Accepted Answer · 2012-12-24 15:52:23Z

Write a Comparator<Set<String>> that compares the size() results from the two Set instances. Use the Collections.sort method that takes a Comparator as the second argument.

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