Source for java.util.RandomAccess

   1: /* RandomAccess.java -- A tagging interface that lists can use to tailor
   2:    operations to the correct algorithm
   3:    Copyright (C) 2001, 2005  Free Software Foundation, Inc.
   4: 
   5: This file is part of GNU Classpath.
   6: 
   7: GNU Classpath is free software; you can redistribute it and/or modify
   8: it under the terms of the GNU General Public License as published by
   9: the Free Software Foundation; either version 2, or (at your option)
  10: any later version.
  11: 
  12: GNU Classpath is distributed in the hope that it will be useful, but
  13: WITHOUT ANY WARRANTY; without even the implied warranty of
  14: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15: General Public License for more details.
  16: 
  17: You should have received a copy of the GNU General Public License
  18: along with GNU Classpath; see the file COPYING.  If not, write to the
  19: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20: 02110-1301 USA.
  21: 
  22: Linking this library statically or dynamically with other modules is
  23: making a combined work based on this library.  Thus, the terms and
  24: conditions of the GNU General Public License cover the whole
  25: combination.
  26: 
  27: As a special exception, the copyright holders of this library give you
  28: permission to link this library with independent modules to produce an
  29: executable, regardless of the license terms of these independent
  30: modules, and to copy and distribute the resulting executable under
  31: terms of your choice, provided that you also meet, for each linked
  32: independent module, the terms and conditions of the license of that
  33: module.  An independent module is a module which is not derived from
  34: or based on this library.  If you modify this library, you may extend
  35: this exception to your version of the library, but you are not
  36: obligated to do so.  If you do not wish to do so, delete this
  37: exception statement from your version. */
  38: 
  39: 
  40: package java.util;
  41: 
  42: /**
  43:  * Marker interface used to inform <code>List</code> implementations that
  44:  * they support fast (usually constant time) random access. This allows
  45:  * generic list algorithms to tailor their behavior based on the list
  46:  * type.
  47:  * <p>
  48:  *
  49:  * For example, some sorts are n*log(n) on an array, but decay to quadratic
  50:  * time on a linked list.  As a rule of thumb, this interface should be
  51:  * used is this loop:<br>
  52:  * <code>for (int i = 0, n = list.size(); i &lt; n; i++) list.get(i);</code>
  53:  * <br>runs faster than this loop:<br>
  54:  * <code>for (Iterator i = list.iterator(); i.hasNext(); ) i.next();</code>
  55:  *
  56:  * @author Eric Blake (ebb9@email.byu.edu)
  57:  * @see List
  58:  * @since 1.4
  59:  * @status updated to 1.4
  60:  */
  61: public interface RandomAccess
  62: {
  63:   // Tagging interface only.
  64: }