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

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

Stuart Kent 6a653b9508 difference-of-squares: remove starter impl		9 lat temu
..
example/java	difference-of-squares: standardize starter implementation	9 lat temu
main/java	difference-of-squares: remove starter impl	9 lat temu
test/java	difference-of-squares: remove "final" from test class (#595)	9 lat temu