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how to output an array of strings to a comma separated list of strings

import java.util.Arrays;

public class StringTest {
    private static String[] colIds = {"abc","def","ghi"};

    public static void main(String[] args) {
        String s = Arrays.toString(colIds);
         // remove leading and trailing brackets, i.e. "[" and "]"
        System.out.println(s.substring(1, s.length()-1));

the output will look like this:
abc, def, ghi

if you take away the substring code, then the output will look like this:
[abc, def, ghi]

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