Improving some plugin user-input code

I made this nice bit of code that I can insert into any of my projects requiring user input. It seems quite long for what it does and I would love some insight as to how I can do this more efficiently i.e. fewer lines of code.

I love to make my code elegant, but I don't see how to do this any better.

String x = (JOptionPane.showInputDialog(". Each parameter should be separated with a ',' and without spaces. (eg. 1,2,3)") + ",");
int w = 0, a = 0, y = -1;
for(int i = 0; i < x.length(); i++)
{
    if(x.charAt(i) == ',')
    {
        w++;
    }
}
Double[] z = new Double[w];
for(int i = 0; i < x.length(); i++)
{
    if(x.charAt(i) == ',')
    {
        z[a] = Double.parseDouble(x.substring((y + 1), i));
        y = i;
        a++;
    }
}

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There is absolutely no need to put parentheses around the first statement (small improvement, but it improves readability). "parameter" is also misspelled (improving readability but in a different way).

String x = JOptionPane.showInputDialog(". Each parameter should be separated with a ',' and without spaces. (eg. 1,2,3)") + ",";

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There is no need to use Double[] when you can use double[]. The difference is, simply put, that a Double can be null while a double can not.

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In the rest of your code it seems like you are reading all the doubles from the String (separated by commas), which can be done much easier like this:

String[] splitted = x.split(",");
double[] result = new double[splitted.length];
for (int i = 0; i < splitted.length; i++) {
    result[i] = Double.parseDouble(splitted[i]);
}

The key here is to use the split-method on the String, which does most of the work for you. For example, it splits the string "0.37,42,21.4" into a string array with the three elements "0.37", "42" and "21.4". The rest of the code loops through that array and converts from String to double.

StackExchange Code Review Q#34066, answer score: 3