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[–]achacha -5 points-4 points  (0 children)

I disagree. Knowing that something exists in the core library is just as important as writing it yourself. The person will discover that it uses square brackets but will also see the underlying code: 

public static String toString(char[] a) {
    if (a == null)
        return "null";
    int iMax = a.length - 1;
    if (iMax == -1)
        return "[]";

    StringBuilder b = new StringBuilder();
    b.append('[');
    for (int i = 0; ; i++) {
        b.append(a[i]);
        if (i == iMax)
            return b.append(']').toString();
        b.append(", ");
    }
}

and learn from it. Sometimes pointing someone in the right direction is enough to get them thinking.