What is the best way to separate double into two parts “integer & fraction” in java

Question

I have tried to separate 5.6 (for example) by the following method:

private static double[] method(double d)
{
    int integerPart = 0;
    double fractionPart =         


        

Answer 1

poor-man solution (using String)

    static double[] sp(double d) {
        String str = String.format(Locale.US, "%f", d);
        int i = str.indexOf('.');
        return new double[] {
            Double.parseDouble(str.substring(0, i)),
            Double.parseDouble(str.substring(i))
        };
    }

(Locale so we really get a decimal point)