java.lang
Interface CharSequence
- CharBuffer, CPStringBuilder, String, StringBuffer, StringBuilder
General functions on a sequence of chars. This interface is implemented
by
String,
StringBuffer and
CharBuffer to give a uniform way to get chars at a certain
index, the number of characters in the sequence and a subrange of the
chars. Indexes start at 0 and the last index is
length()-1.
Even when classes implement this interface they are not always
exchangeble because they might implement their compare, equals or hash
function differently. This means that in general one should not use a
CharSequence as keys in collections since two sequences
with the same chars at the same indexes with the same length might not
have the same hash code, be equal or be comparable since the are
represented by different classes.
char | charAt(int i)- Returns the character at the given index.
|
int | length()- Returns the length of the sequence.
|
CharSequence | subSequence(int begin, int end)- Returns a new
CharSequence of the indicated range.
|
String | toString()- Returns the complete
CharSequence as a String.
|
charAt
public char charAt(int i)
Returns the character at the given index.
i - the index to retrieve from
- the character at that location
length
public int length()
Returns the length of the sequence. This is the number of 16-bit
characters in the sequence, which may differ from the length of the
underlying encoding.
subSequence
public CharSequence subSequence(int begin,
int end) Returns a new CharSequence of the indicated range.
begin - the start index (inclusive)end - the end index (exclusive)
toString
public String toString()
Returns the complete CharSequence as a String.
Classes that implement this interface should return a String
which contains only the characters in the sequence in the correct order.
- toString in interface Object
- the character sequence as a String
CharSequence.java -- Anything that has an indexed sequence of chars
Copyright (C) 2001, 2002 Free Software Foundation, Inc.
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