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Array manipulation:

int[][] twoDim = {{1,2}, {3,4}}; // define and give some values
int[] oneDim = twoDim[0]; // copy first row to save
twoDim[0] = twoDim[1]; ...

So the the sortBySimpleInterest() method is named the sortBySimple()?

The formatting on that posted code is poor. Statements nested inside of {} should be indented 3-4 spaces. Poor formatting...

It would be sorted by the row based on the contents of the first column?

Where is the sortBySimpleInterest() method? I don't find it in the posted code.

How do you want to order the contents of the 2 dim array? By row depending on the contents of a specific column?

Can you give an example of a small unsorted array and what it would be after...