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|Java - Interview Questions and Answers|
|Ans. The purpose of comparator interface is to compare objects of the same class to identify the sorting order. Sorted Collection Classes ( TreeSet, TreeMap ) have been designed such to look for this method to identify the sorting order, that is why class need to implement Comparator interface to qualify its objects to be part of Sorted Collections.|
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|Like Discuss Correct / Improve  java   collections   treemap   treeset   comparator Asked in 2 Companies Intermediate|
Try 2 Question(s) Test
|Difference beween HashSet and TreeSet ?|
|If I try to add Enum constants to a TreeSet, What sorting order will it use ?|
|Which are the sorted collections ?|
|If we add Enum constants to a sorted collection ( Treemap , TreeSet ), What will be the order in which they will be maintained ?|
|What is the difference between TreeSet and TreeMap ?|
|Which of the following is insertion heavy - HashSet or TreeSet ?|
|How to sort objects based on one of the field ?|