CopyOnWriteArrayList

CopyOnWriteArrayList
Implements following Interfaces

• Serializable,
• Cloneable
• Iterable<E>
• Collection<E>
• List<E>
• RandomAccess

It has three constructors

• CopyOnWriteArrayList()
• CopyOnWriteArrayList(Collection<? extends E> c)
• CopyOnWriteArrayList(E[] toCopyIn)

Point to Remember

• Available in java.util.concurrent Package.
• Available since java 1.5.
• It is a thread safe variant of ArrayList.
• It perform all mutative operations (add, set etc) by making a copy of the underlying Array.
• Element changing operation (add, remove, set) are not allowed in iterator.
• It is useful when you dont want to synchrozine the traversal operation.
• It never changes during the lifetime of the Iterator.
• Iterator is guaranteed not to throw ConcurrentModificationException.
• It allows null.