| 1 | /* RandomAccess.java -- A tagging interface that lists can use to tailor
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| 2 | operations to the correct algorithm
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| 3 | Copyright (C) 2001 Free Software Foundation, Inc.
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| 4 |
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| 5 | This file is part of GNU Classpath.
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| 6 |
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| 7 | GNU Classpath is free software; you can redistribute it and/or modify
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| 8 | it under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 2, or (at your option)
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| 10 | any later version.
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| 11 |
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| 12 | GNU Classpath is distributed in the hope that it will be useful, but
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| 13 | WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 15 | General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with GNU Classpath; see the file COPYING. If not, write to the
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| 19 | Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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| 20 | 02111-1307 USA.
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| 21 |
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| 22 | Linking this library statically or dynamically with other modules is
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| 23 | making a combined work based on this library. Thus, the terms and
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| 24 | conditions of the GNU General Public License cover the whole
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| 25 | combination.
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| 26 |
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| 27 | As a special exception, the copyright holders of this library give you
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| 28 | permission to link this library with independent modules to produce an
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| 29 | executable, regardless of the license terms of these independent
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| 30 | modules, and to copy and distribute the resulting executable under
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| 31 | terms of your choice, provided that you also meet, for each linked
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| 32 | independent module, the terms and conditions of the license of that
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| 33 | module. An independent module is a module which is not derived from
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| 34 | or based on this library. If you modify this library, you may extend
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| 35 | this exception to your version of the library, but you are not
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| 36 | obligated to do so. If you do not wish to do so, delete this
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| 37 | exception statement from your version. */
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| 38 |
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| 39 |
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| 40 | package java.util;
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| 41 |
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| 42 | /**
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| 43 | * Marker interface used to inform <code>List</code> implementations that
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| 44 | * they support fast (usually constant time) random access. This allows
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| 45 | * generic list algorithms to tailor their behavior based on the list
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| 46 | * type.
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| 47 | * <p>
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| 48 | *
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| 49 | * For example, some sorts are n*log(n) on an array, but decay to quadratic
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| 50 | * time on a linked list. As a rule of thumb, this interface should be
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| 51 | * used is this loop:<br>
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| 52 | * <code>for (int i = 0, n = list.size(); i < n; i++) list.get(i);</code>
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| 53 | * <br>runs faster than this loop:<br>
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| 54 | * <code>for (Iterator i = list.iterator(); i.hasNext(); ) i.next();</code>
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| 55 | *
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| 56 | * @author Eric Blake <ebb9@email.byu.edu>
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| 57 | * @see List
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| 58 | * @since 1.4
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| 59 | * @status updated to 1.4
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| 60 | */
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| 61 | public interface RandomAccess
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| 62 | {
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| 63 | // Tagging interface only.
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| 64 | }
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