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package java.util;
/**
* Marker interface used by {@code 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.
* <p>The best algorithms for manipulating random access lists (such as
* {@code ArrayList}) can produce quadratic behavior when applied to
* sequential access lists (such as {@code LinkedList}). Generic list
* algorithms are encouraged to check whether the given list is an
* {@code 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.
* <p>It is recognized that the distinction between random and sequential
* access is often fuzzy. For example, some {@code List} implementations
* provide asymptotically linear access times if they get huge, but constant
* access times in practice. Such a {@code List} implementation
* should generally implement this interface. As a rule of thumb, a
* {@code List} implementation should implement this interface if,
* for typical instances of the class, this loop:
* <pre>
* for (int i=0, n=list.size(); i < n; i++)
* list.get(i);
* </pre>
* runs faster than this loop:
* for (Iterator i=list.iterator(); i.hasNext(); )
* i.next();
* <p>This interface is a member of the
* <a href="{@docRoot}/java.base/java/util/package-summary.html#CollectionsFramework">
* Java Collections Framework</a>.
* @since 1.4
public interface RandomAccess {
}