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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.
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dude I never thought of importing java.lang.Object
The Integer class already converts decimal to hex string. However if it didn't, I suggest you use switch(decimalDigit)
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Completely forgot you could multiply i in a for loop, this is the upgraded version of mine