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  /*
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   * Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved.
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   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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   *
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   * This code is free software; you can redistribute it and/or modify it
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   * under the terms of the GNU General Public License version 2 only, as
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   * published by the Free Software Foundation.  Oracle designates this
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   * particular file as subject to the "Classpath" exception as provided
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   * by Oracle in the LICENSE file that accompanied this code.
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  *
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  * This code is distributed in the hope that it will be useful, but WITHOUT
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  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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  * version 2 for more details (a copy is included in the LICENSE file that
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  * accompanied this code).
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  *
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  * You should have received a copy of the GNU General Public License version
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  * 2 along with this work; if not, write to the Free Software Foundation,
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  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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  *
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  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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  * or visit www.oracle.com if you need additional information or have any
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  * questions.
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  */
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 package java.lang;


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 Object.equals(java.lang.Object) and Object.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.

Author(s):
Mike McCloskey
Since:
1.4
Spec:
JSR-51
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 public interface CharSequence {

    
Returns the length of this character sequence. The length is the number of 16-bit chars in the sequence.

Returns:
the number of chars in this sequence
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     int length();

    
Returns the 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.

Parameters:
index the index of the char value to be returned
Returns:
the specified char value
Throws:
IndexOutOfBoundsException if the index argument is negative or not less than length()
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     char charAt(int index);

    
Returns a new 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 chars) 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
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    CharSequence subSequence(int start, int end);

    
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.

Returns:
a string consisting of exactly this sequence of characters
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    public String toString();
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