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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.
Elements on the left side of this operator => are arguments to the class, elements on the right side is the expreison of the class. ? and : are operators of boolean (if-else) expression, simply if "(n > 0 && m > 0)" is true it uses the left side of : operator if false right side. You can read more about other operators here: https://docs.oracle.com/javase/tutorial/java/nutsandbolts/opsummary.html