Java Set retain order?

Question

Does a Java Set retain order? A method is returning a Set to me and supposedly the data is ordered but iterating over the Set, the data is unordered. Is there a better way to manage this? Does the method need to be changed to return something other than a Set?

Answer 1

Set is just an interface. To retain order, you need to use a specific implementation of that interface and the sub-interface SortedSet, for example, you can use either TreeSet or LinkedHashSet. You can wrap your Set in the following way:

Set myOrderedSet = new LinkedHashSet(mySet);

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