Copyonwritearray Unsafe (Array) collection under concurrent packages

Copyonwritearray, record it.

Package java.util.concurrent;//You're not mistaken, it's this bag.

Private transient volatile object[] array;//initialize array public copyonwritearraylist () {//constructor, initialize        SetArray (new object[0] );    } final void SetArray (object[] a) {        array = A;    } Public boolean Add (E e) {        final reentrantlock lock = This.lock;        Lock.lock ();        try {            object[] elements = GetArray ();            int len = elements.length;            object[] newelements = arrays.copyof (elements, Len + 1);            Newelements[len] = e;            SetArray (newelements);            return true;        } finally {            lock.unlock ();        }    } Final object[] GetArray () {        return array;    }
Public E get (int index) {//Get a single Array object        return get (GetArray (), index);    }
Private E get (object[] A, int index) {        return (E) a[index];    }

Add when the yoke, first copy, then assign value, get when the time is not locked, (resulting in multi-threaded when may not get the nearest value)

Copyonwritearray Unsafe (Array) collection under concurrent packages