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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.
else if (input < 0) input = 255;
This condition is always false. Input has char type, which is unsigned in Java (always greater than or equal to 0). Should be used int instead for check and then converted to char when needed.