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what it means is the exact literal translation of what it means, dry run the code with an example number to prove the recursion... I.E enter multiply(8); then explain line by line whats happening i.e...

ermmm, just do classname.stringRoot("1600")

don't think you need to make an object to use a classes method?

postfix/prefix i think(the order you do the math), if your wanting it to add the x either put it in the brackets that exist or put another set of brackets around the +1. my thinking is that its just...

Partly related to regular expression, the code is finding any tab indentation and replacing it with a single space...check regular expression and escape sequences for more information regarding the \t

30 or so video tutorials on animation, threads, input etc

Java Game Development Tutorials - YouTube

use code tags...also is there anything specific you need to know? you named most the concepts being used in your post, do you need these concepts quoting from your code and explaining and if so...