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:

double [][] values = {{0, 4.28}, {10, 4.93}, {20, 3.75}};

I've formatted the string to remove any whitespace and replace with a comma:

String stringProfileFormatted = stringProfile.replaceAll(" ", ",");

So now String stringProfileFormatted = "0,4.28,10,4.93,20,3.75";

I then create a String array:

String[] array = stringProfileFormatted.split("(?<!\\G\\d+),");

So for every element in the Array is every 2 commas worth of string.

Not sure how to then convert into a 2d array. Is this even the right way to go about it?

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).

Answer 2

What about something like this:

Arrays.stream("0,4.28 10,4.93 20,3.75".split(" ")) //Stream<String>
     .map(s -> 
           Arrays.stream(s.split(",")) // take an individual string like 0,4.28  
                 .map(Double::parseDouble) // and transform it to a double array
                 .toArray(Double[]::new)
      )
     .toArray(Double[][]::new);

the result is

$8 ==> Double[3][] { 
        Double[2] { 0.0, 4.28 }, 
        Double[2] { 10.0, 4.93 }, 
        Double[2] { 20.0, 3.75 } 
}