Question

I have an array of floats and I would like to convert it to an array of doubles in Java. I am aware of the obvious way of iterating over the array and creating a new one. I expected Java to digest a float[] smoothly where it wishes to work with double[]… but it can not work with this.
What is the elegant, effective way of doing this conversion?

Answer 1

Basically something has to do the conversion of each value. There isn’t an implicit conversion between the two array types because the code used to handle them after JITting would be different – they have a different element size, and the float would need a conversion whereas the double wouldn’t. Compare this to array covariance for reference types, where no conversions are required when reading the data (the bit pattern is the same for a String reference as an Object reference, for example) and the element size is the same for all reference types.

In short, something will have to perform conversions in a loop. I don’t know of any built-in methods to do this. I’m sure they exist in third party libraries somewhere, but unless you happen to be using one of those libraries already, I’d just write your own method. For the sake of convenience, here’s a sample implementation:

public static double[] convertFloatsToDoubles(float[] input)
{
    if (input == null)
    {
        return null; // Or throw an exception - your choice
    }
    double[] output = new double[input.length];
    for (int i = 0; i < input.length; i++)
    {
        output[i] = input[i];
    }
    return output;
}