ToUpperCase (map)

Convert elements of a collection to upper case.

FilterCollection (filter)

Filter collection so that only elements with less then 4 characters are returned.

FlatCollection (flatMap)

Flatten multidimensional collection

OldestPerson (max, comparator)

Get oldest person from the collection

Sum (reduce)

Sum all elements of a collection

Kids (filter, map)

Get names of all kids (under age of 18)

PeopleStats (summaryStatistics)

Get people statistics: average age, count, maximum age, minimum age and sum og all ages.

Partitioning (partitioningBy)

Partition adults and kids

Grouping (groupingBy)

Group people by nationality

Grouping and counting (maxBy)

Selct most common nationality