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Java 8 Stream API allows us write awesome one-liner:
Step-by-step:
- Alex Lopashev April 09, 20151. Convert int[] to Stream<Integer>;
2. Construct Map<Integer, Long> with distinct input numbers as keys (Integer) and their frequency (Long) as values;
3. Convert Map<Integer, Long> to Stream<Map.Entry<Integer, Long>;
4. Sort stream members by frequency then by actual number (for total order);
5. Set limit from our input data;
6. Convert Stream<Integer> to int[] through IntStream;