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Some parallel methods in the standard libraries
In the current Java 8, java.util.Arrays includes
parallelSort method that implements a parallel merge sort
In addition, java.util.Arrays provides
parallelPrefix for computing all the cumulative prefixes
of the array w.r.t.\ an associative binary operator, and
parallelSetAll that sets the values of an array according to
some function
The scala parallel collections library also provides parallel ways for computing folds, maximum elements etc.
They are quite good in general,
try using them if
the computer has many cores available,
the applied operations are independent and thus parallelize, and
the size of the collections is large or
the applied operations take non-negligible amount of time