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Java™ Platform Standard Ed. 6 |
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public interface CharSequence
A CharSequence is a readable sequence of char
values. This
interface provides uniform, read-only access to many different kinds of
char
sequences.
A char
value 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 equals
and 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
a map.
Method Summary | |
---|---|
char |
charAt(int index)
Returns the char value at the specified index. |
int |
length()
Returns the length of this character sequence. |
CharSequence |
subSequence(int start,
int end)
Returns a new CharSequence that is a subsequence of this sequence. |
String |
toString()
Returns a string containing the characters in this sequence in the same order as this sequence. |
Method Detail |
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int length()
char
s in the sequence.
char
s in this sequencechar charAt(int index)
char
value at the specified index. An index ranges from zero
to length() - 1. The first char
value of the sequence is at
index zero, the next at index one, and so on, as for array
indexing.
If the char
value specified by the index is a
surrogate, the surrogate
value is returned.
index
- the index of the char
value to be returned
char
value
IndexOutOfBoundsException
- if the index argument is negative or not less than
length()CharSequence subSequence(int start, int end)
CharSequence
that is a subsequence of this sequence.
The subsequence starts with the char
value at the specified index and
ends with the char
value at index end - 1. The length
(in char
s) of the
returned sequence is end - start, so if start == end
then an empty sequence is returned.
start
- the start index, inclusiveend
- the end index, exclusive
IndexOutOfBoundsException
- if start or end are negative,
if end is greater than length(),
or if start is greater than endString toString()
toString
in class Object
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Java™ Platform Standard Ed. 6 |
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