How do I convert Double[] to double[]?

Question

I\'m implementing an interface that has functionality similar to a table that can contain an types of objects. The interface specifies the following function:

Answer 1

You could use a for each loop to construct a temp array of the same size then cast each individual element to double and but it in the array.

SO:

double[] tempArray = new double[data[columnIndex].length];
int i = 0;
for(Double d : (Double) data[columnIndex]) {
  tempArray[i] = (double) d;
  i++;
}

Please correct me if I am dead wrong here.