JavaTM 2 Platform Std. Ed. v1.4.2
- All Known Implementing Classes:
- CharBuffer, String, StringBuffer
- public interface CharSequence
A CharSequence is a readable sequence of characters. This
interface provides uniform, read-only access to many different kinds of
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
Returns the character at the specified index.
Returns the length of this character sequence.
Returns a new character sequence that is a subsequence of this sequence.
Returns a string containing the characters in this sequence in the same
order as this sequence.
public int length()
- Returns the length of this character sequence. The length is the number
of 16-bit Unicode characters in the sequence.
- the number of characters in this sequence
public char charAt(int index)
- Returns the character at the specified index. An index ranges from zero
to length() - 1. The first character of the sequence is at
index zero, the next at index one, and so on, as for array
index - the index of the character to be returned
- the specified character
IndexOutOfBoundsException - if the index argument is negative or not less than
public CharSequence subSequence(int start,
- Returns a new character sequence that is a subsequence of this sequence.
The subsequence starts with the character at the specified index and
ends with the character at index end - 1. The length 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
- the specified subsequence
IndexOutOfBoundsException - if start or end are negative,
if end is greater than length(),
or if start is greater than end
public String toString()
- Returns a string containing the characters in this sequence in the same
order as this sequence. The length of the string will be the length of
toString in class
- a string consisting of exactly this sequence of characters
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