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/*

This is not an official specification document, and usage is restricted.

NOTICE


(c) 2005-2007 Sun Microsystems, Inc. All Rights Reserved.

Neither this file nor any files generated from it describe a complete specification, and they may only be used as described below. For example, no permission is given for you to incorporate this file, in whole or in part, in an implementation of a Java specification.

Sun Microsystems Inc. owns the copyright in this file and it is provided to you for informative, as opposed to normative, use. The file and any files generated from it may be used to generate other informative documentation, such as a unified set of documents of API signatures for a platform that includes technologies expressed as Java APIs. The file may also be used to produce "compilation stubs," which allow applications to be compiled and validated for such platforms.

Any work generated from this file, such as unified javadocs or compiled stub files, must be accompanied by this notice in its entirety.

This work corresponds to the API signatures of JSR 219: Foundation Profile 1.1. In the event of a discrepency between this work and the JSR 219 specification, which is available at http://www.jcp.org/en/jsr/detail?id=219, the latter takes precedence. */ package java.util; /** * Marker interface used by List implementations to indicate that * they support fast (generally constant time) random access. The primary * purpose of this interface is to allow generic algorithms to alter their * behavior to provide good performance when applied to either random or * sequential access lists. * *

The best algorithms for manipulating random access lists (such as * ArrayList) can produce quadratic behavior when applied to * sequential access lists (such as LinkedList). Generic list * algorithms are encouraged to check whether the given list is an * instanceof this interface before applying an algorithm that would * provide poor performance if it were applied to a sequential access list, * and to alter their behavior if necessary to guarantee acceptable * performance. * *

It is recognized that the distinction between random and sequential * access is often fuzzy. For example, some List implementations * provide asymptotically linear access times if they get huge, but constant * access times in practice. Such a List implementation * should generally implement this interface. As a rule of thumb, a * List implementation should implement this interface if, * for typical instances of the class, this loop: *

 *     for (int i=0, n=list.size(); i < n; i++)
 *         list.get(i);
 * 
* runs faster than this loop: *
 *     for (Iterator i=list.iterator(); i.hasNext(); )
 *         i.next();
 * 
* *

This interface is a member of the * * Java Collections Framework. * */ public interface RandomAccess { }





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