StringUtils.java

public static String stringToHardcodedCharArray(@NotNull String s) {
    char[] chars = s.toCharArray();

    StringBuilder output = new StringBuilder("char[] key = {");

    if (chars.length > 0) {
        output.append("'").append(chars[0]).append("'");

        for (int i = 1; i < chars.length; i++) {
            output.append(",'").append(chars[i]).append("'");
        }
    }

    return output.append("};").toString();
}