Answer by Frank Hou for string to string array conversion in java

/**
 * <pre>
 * MyUtils.splitString2SingleAlphaArray(null, "") = null
 * MyUtils.splitString2SingleAlphaArray("momdad", "") = [m,o,m,d,a,d]
 * </pre>
 * @param str  the String to parse, may be null
 * @return an array of parsed Strings, {@code null} if null String input
 */
public static String[] splitString2SingleAlphaArray(String s){
    if (s == null )
        return null;
    char[] c = s.toCharArray();
    String[] sArray = new String[c.length];
    for (int i = 0; i < c.length; i++) {
        sArray[i] = String.valueOf(c[i]);
    }
    return sArray;
}

Method String.split will generate empty 1st, you have to remove it from the array. It's boring.