Convert a 2D array index into a 1D index

Question

I have two arrays for a chess variant I am coding in java...I have a console version so far which represents the board as a 1D array (size is 32) but I am working on making

Answer 1

Every row in your 2D array is placed end to end in your 1D array. i gives which row you are in, and j gives the column (how far into that row). so if you are in the ith row, you need to place i complete rows end to end, then append j more onto that to get your single array index.

So it will be something like
singleDimIndex = array[0].length * i + j