java.util
Interface RandomAccess
- ArrayList<E>, AttributeList, CopyOnWriteArrayList<E>, CorbaList, Stack<T>, Vector<T>
Marker interface used to inform
List implementations that
they support fast (usually constant time) random access. This allows
generic list algorithms to tailor their behavior based on the list
type.
For example, some sorts are n*log(n) on an array, but decay to quadratic
time on a linked list. As a rule of thumb, this interface should be
used is 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();
RandomAccess.java -- A tagging interface that lists can use to tailor
operations to the correct algorithm
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