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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.
Cause StringBuffer is thread-safe and used only if you have multi-threading programm and need synchronisation. So, it's work slower that StringBuilder. In this case there are no reasons to choose StringBuffer, cause we have just one thread.
A broken egg is, obviously, broken, so you can't use it again.