What is the difference between String.subString() and String.subSequence()

Question

String.subSequence() has the following javadoc:

Returns a new character sequence that is a subsequence of this sequence.

Answer 1

Basically it is just what is returned. One a String and the other a CharSequence (which you can cast as a string).
You would use the subSequence when you need a CharSequence type of variable.