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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.
It only works when the variables are the same type. e.g. here
iandjare bothint.Hint: It pays to re-visit the language spec sometimes. There are lots of little things that are useful but maybe you don't see them much in common use. Do it now. You will quickly learn something else you didn't know about...
Not sure what you mean... It's just common syntax
https://docs.oracle.com/javase/specs/jls/se8/html/jls-14.html#jls-14.14.1