- seq
- the source array of char units.
- index
- the position in seq following the code point that should be returned.
- start
- the index of the first element in seq.
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Type Reason Java.Lang.NullPointerException if seq is null. Java.Lang.IndexOutOfBoundsException if the index <= start, start , index is greater than the length of seq, or if start is equal or greater than the length of seq.
Returns the code point that precedes the index in the specified array of character units and is not less than start. If the unit at index - 1 is a low-surrogate unit, index - 2 is not less than start and the unit at index - 2 is a high-surrogate unit, then the supplementary code point represented by the pair is returned; otherwise the char value at index - 1 is returned.