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

Zach Waltman 62d9c5b26c Fix spelling errors in custom-set, word-count test names		hace 9 años
..
src	Fix spelling errors in custom-set, word-count test names	hace 9 años
README.md	Replace exercise templates with track-level default	hace 9 años
build.gradle	Format build.gradle files	hace 9 años

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

To run the tests:

$ gradle test

For more detailed info about the Java track see the help page.

Source

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.