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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
For Java 8 usage of stream would be better. Like usage of "Collection.max"/"Collection.min". As its good solution for Java 7 I give "Best Practice" point:)
Sorry, I forget to change it to a correct one
I dont see you using imported DecimalFormat so assume you ran into same java.lang.NumberFormatException: For input string: "-7488,83" as I did?