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I repeat the question: are you trying to "shuffle" an array? It's easy to do and there is no need to use strange/unuseful internal loops to verify if "is already in array".

In general, given an...

First, these are not "instance" variables .... but "class" variables. And it's not correct for your intentions.
The char[] alpha has sense that it is "static", not the others.


Second, this part...