java - sum of cubes of first n even/odd numbers

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import java.util.stream.LongStream; public class _Math2 { public static long sum_of_cubes_of_first_n_even_numbers(int n) { return (long) LongStream.iterate(2, i -> i + 2).limit(n).mapToDouble(i -> Math.pow(i, 3)).sum(); } public static long sum_of_cubes_of_first_n_odd_numbers(int n) { return (long) LongStream.iterate(1, i -> i + 2).limit(n).mapToDouble(i -> Math.pow(i, 3)).sum(); } }

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