lots of exercises in java... from https://github.com/exercism/java

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Word Count

Given a phrase, count the occurrences of each word in that phrase.

For example for the input "olly olly in come free"

olly: 2
in: 1
come: 1
free: 1

Running the tests

You can run all the tests for an exercise by entering

$ gradle test

in your terminal.

This is a classic toy problem, but we were reminded of it by seeing it in the Go Tour.

It's possible to submit an incomplete solution so you can see how others have completed the exercise.