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1. See java.util.Random.nextInt(int n)
2. I do not understand what trouble you are having in setting a variable to some value, in this case the random number. Please post a specific question

I don't think so.

How did you set the values in the table the first time? Do the same thing using the value y (from your example) instead of what ever value you used the last time.
If this is of...