Turn string values into 2d array of type double

Question

I have a string:

String stringProfile = \"0,4.28 10,4.93 20,3.75\";

I am trying to turn it into an array like as follows:

d         


        

Answer 1

I would go step by step resolving this task.

First, I would split the original String by a space, then split the results by comma each and afterwards create an array of double out of those values with Double.parseDouble(String value).

public static void main(String[] args) {
    String stringProfile = "0,4.28 10,4.93 20,3.75";

    // split it once by space
    String[] parts = stringProfile.split(" ");

    // create some result array with the amount of double pairs as its dimension
    double[][] results = new double[parts.length][];

    // iterate over the result of the first splitting
    for (int i = 0; i < parts.length; i++) {
        // split each one again, this time by comma
        String[] values = parts[i].split(",");

        // create two doubles out of the single Strings
        double a = Double.parseDouble(values[0]);
        double b = Double.parseDouble(values[1]);

        // add them to an array
        double[] value = {a, b};

        // add the array to the array of arrays
        results[i] = value;
    }

    // then print the result
    for (double[] pair : results) {
        System.out.println(String.format("%.0f and %.2f", pair[0], pair[1]));
    }
}

Yes, these are a lot of lines of code, but most likely more easily understandable than lambda expressions (which are cooler and more elegant in my opinion).