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There are many sort algorithms. Which do you plan to use?
What steps must be taken to implement this type of sort?
List out the steps to take and work on one step at a time.
If you have any...

Arrays are numbered beginning with zero.
So an array with a size of 5 will have elements numbered 0 1 2 3 and 4

Considering the code in post #8, why are you passing the size of oldArray to the...

Did you look up NullPointerException to see what causes it?
The error message tells you where to look, so look there for the cause of the NPE. Which variable is null and why was it not initialized?

I will take a shorter lunch break next time. No, on second thought I will continue to volunteer my time when I feel like it, thanks for the consideration anyway.
Please post all relevant code on the...

Welcome Chris07

....yeah, what KevinWorkman said.