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Java Streams Coding DOJO

Coding DOJO to play with Java 8 Streams API.

Exercises

  • ToUpperCase(map): convert elements of a collection to upper case

  • FilterCollection(filter): filter collection so that only elements with less than 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 (age under 18)

  • PeopleStats(summaryStatistics): get people statistics: average age, count, max age, min age and sum of all ages

  • Partitioning(partitioningBy): partition adults and kids

  • Grouping(groupingBy): group people by house

  • Joining(joining): join people by names