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

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

vivshaw 15a2145814 remove final from class declaration in flatten-array exercise		9 lat temu
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example/java	flatten-array: without type safety (#255)	9 lat temu
main/java	remove final from class declaration in flatten-array exercise	9 lat temu
test/java	Merge pull request #580 from morrme/flattener-remove-final	9 lat temu