Java: Iterate a String

java.text.CharacterIterator;

java.text.StringCharacterIterator;

CharacterIterator it = new StringCharacterIterator("abcd");

// Iterate over the characters in the forward direction
for (char ch=it.first(); ch != CharacterIterator.DONE; ch=it.next()) {
    // Use ch ...
}

Reference:

http://www.exampledepot.com/egs/java.text/StrIter.html