How to split a string array into small chunk arrays in java?

Question

Below is the example of the code snippet which needs the help

Example:

[1,2,3,4,5]

• if the chunk size is 1,

Answer 1

This should do the trick

public static List split(String string, int chunk) {
    Pattern pattern = Pattern.compile("(([0-9]+,){" + (chunk - 1)
            + "}[0-9]+)|[0-9]+");
    Matcher matcher = pattern.matcher(string);

    List result = new ArrayList();
    while (matcher.find())
        result.add("[" + matcher.group() + "]");

    return result;
}

Test code:

for (int chunkSize = 1; chunkSize < 6; ++chunkSize) {
    System.out.println("test for chunk size: " + chunkSize);
    for (String string : split("[1,2,3,4,5]", chunkSize))
        System.out.format("\t%s\n", string);
}

Output:

test for chunk size: 1
    [1]
    [2]
    [3]
    [4]
    [5]
test for chunk size: 2
    [1,2]
    [3,4]
    [5]
test for chunk size: 3
    [1,2,3]
    [4]
    [5]
test for chunk size: 4
    [1,2,3,4]
    [5]
test for chunk size: 5
    [1,2,3,4,5]