JavaTM 2 Platform
Std. Ed. v1.4.2

java.lang
Interface CharSequence

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 character sequences.

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.

Since:
1.4

Method Summary
 char charAt(int index)
          Returns the character at the specified index.
 int length()
          Returns the length of this character sequence.
 CharSequence subSequence(int start, int end)
          Returns a new character sequence 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

length

public int length()
Returns the length of this character sequence. The length is the number of 16-bit Unicode characters in the sequence.

Returns:
the number of characters in this sequence

charAt

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 indexing.

Parameters:
index - the index of the character to be returned
Returns:
the specified character
Throws:
IndexOutOfBoundsException - if the index argument is negative or not less than length()

subSequence

public CharSequence subSequence(int start,
                                int end)
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.

Parameters:
start - the start index, inclusive
end - the end index, exclusive
Returns:
the specified subsequence
Throws:
IndexOutOfBoundsException - if start or end are negative, if end is greater than length(), or if start is greater than end

toString

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 this sequence.

Overrides:
toString in class Object
Returns:
a string consisting of exactly this sequence of characters

JavaTM 2 Platform
Std. Ed. v1.4.2

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.


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