To start you off on your assignment, String.split
splits strings on a regular expression and this expression may be an empty string:
String[] ary = "abc".split("");
Yields the array:
(java.lang.String[]) [, a, b, c]
Getting rid of the empty 1st entry is left as an exercise for the reader 🙂
Note: In Java 8, the empty first element is no longer included.
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