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Split a string into pieces using java / best code

I need to break this line:

00016282000079116050

He has predefined pieces. It should be like this:

00016 282 00 0079 116 050

I made this code:

String unformatted = String.valueOf("00016282000079116050");
String str1 = unformatted.substring(0,5); 
String str2 = unformatted.substring(5,8);
String str3 = unformatted.substring(8,10);
String str4 = unformatted.substring(10,14);
String str5 = unformatted.substring(14,17);
String str6 = unformatted.substring(17,20);

System.out.println(String.format("%s %s %s %s %s %s", str1, str2, str3, str4, str5, str6));

This works, but I need to make this code more presentable / beautiful.

Something with Java threads or regex should be good. Any suggestions?

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3 answers

You can use regex to compile Patternwith 6 groups, something like

String unformatted = "00016282000079116050"; // <-- no need for String.valueOf
Pattern p = Pattern.compile("(\\d{5})(\\d{3})(\\d{2})(\\d{4})(\\d{3})(\\d{3})");
Matcher m = p.matcher(unformatted);
if (m.matches()) {
    System.out.printf("%s %s %s %s %s %s", m.group(1), m.group(2), m.group(3), 
            m.group(4), m.group(5), m.group(6));
}

Outputs (on request)

00016 282 00 0079 116 050

Or , as pointed out in the comments, you can use Matcher.replaceAll(String)as

if (m.matches()) {
    System.out.println(m.replaceAll("$1 $2 $3 $4 $5 $6"));
}
+9
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java .

int[] lims = {5,3,2,4,3,3};
int total = 0;
String original = "00016282000079116050";

for (int i = 0 ; i < lims.length ; i++) {
    System.out.print(original.substring(total, total+=lims[i]) + " ");
}


00016 282 00 0079 116 050
+4
        String unformatted = "00016282000079116050";
        int[] splittingPoints = new int[]{5,3,2,4,3,3};
        int charactersProcessed = 0;
        int howManyBeforeSplit = 0;
        int chunksDone = 0;
        for (char c : unformatted.toCharArray()) {
            if ((charactersProcessed++ - chunksDone) == splittingPoints[howManyBeforeSplit]) {
                System.out.print(" ");
                chunksDone += splittingPoints[howManyBeforeSplit++];
            }
            System.out.print(c);
        }
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