Fastest way to read/store lots of multidimensional data? (Java)

Question

I have three questions about three nested loops:

for (int x=0; x<400; x++)
{
    for (int y=0; y<300; y++)
    {
        for (int z=0; z<400; z++)
          


        

Answer 1

Have you tried this:

Object[][][] store = new Object[ 400 ][300][400];

for (int x=0; x<400; x++)
{
    Object[][] matrix = store[x];

    for (int y=0; y<300; y++)
    {
        Object[] line = matrix[y];
        for (int z=0; z<400; z++)
        {
             // compute and store value
             line[z] = // result;
        }
    }
}

it might improve your cache thrashing.