public interface CharSequence
charvalues. This interface provides uniform, read-only access to many different kinds of
charvalue represents a character in the Basic Multilingual Plane (BMP) or a surrogate. Refer to Unicode Character Representation for details.
This interface does not refine the general contracts of the
hashCode methods. The result of comparing two
objects that implement CharSequence is therefore, in general,
undefined. Each object may be implemented by a different class, and there
is no guarantee that each class will be capable of testing its instances
for equality with those of the other. It is therefore inappropriate to use
arbitrary CharSequence instances as elements in a set or as keys in
|Modifier and Type||Method and Description|
Returns the length of this character sequence.
Returns a new
Returns a string containing the characters in this sequence in the same order as this sequence.
char charAt(int index)
charvalue at the specified index. An index ranges from zero to length() - 1. The first
charvalue of the sequence is at index zero, the next at index one, and so on, as for array indexing.
char value specified by the index is a
surrogate, the surrogate
value is returned.
index- the index of the
charvalue to be returned
IndexOutOfBoundsException- if the index argument is negative or not less than length()
chars in the sequence.
chars in this sequence
CharSequence subSequence(int start, int end)
CharSequencethat is a subsequence of this sequence. The subsequence starts with the
charvalue at the specified index and ends with the
charvalue at index end - 1. The length (in
chars) of the returned sequence is end - start, so if start == end then an empty sequence is returned.
start- the start index, inclusive
end- the end index, exclusive
IndexOutOfBoundsException- if start or end are negative, if end is greater than length(), or if start is greater than end
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