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Java coders, I need help

DEFCON
in Main Hall

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can you feed an array of undefined size to a method or have one as a class variable? Say i want a method to accept an array as a parameter, but i dont want to specifiy what array size. Further, is there a function i can use to find an array's size. Really bsaic stuff, i know, but i am UBER rusty.
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    I can make stupid little colored squares with my java...i know that doesn't help but it might make you feel less UBER :D
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