#Java array vs arraylist example how to
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How to convert long to String in Java? Example.How to convert ByteBuffer to String in Java.What is fail safe and fail fast Iterator in Java?.How to format numbers in Java? - NumberFormat Example.In this Java Collection tutorial we will see What is CopyOnWriteArrayList in Java, Difference between ArrayList and CopyOnWriteArrayList in Java and One simple Java program example on How to use CopyOnWriteArrayList in Java.ĭifference between CopyOnWriteArrayList and ArrayList in Java. Consequently, all the updates made on CopyOnWriteArrayList is not available to Iterator (see Java Fundamentals: Collections). Iterator of CopyOnWriteArrayList is fail-safe and doesn't throw ConcurrentModificationException even if underlying CopyOnWriteArrayList is modified once Iteration begins because Iterator is operating on a separate copy of ArrayList. you mostly need to iterate the ArrayList and don't modify it too often. Normally CopyOnWriteArrayList is very expensive because it involves costly Array copy with every writes operation but it's very efficient if you have a List where Iteration outnumbers mutation e.g. That's why it is only suitable for a small list of values which are read frequently but modified rarely e.g. As the name suggests CopyOnWriteArrayList creates a copy of underlying ArrayList with every mutation operation e.g. CopyOnWriteArrayList implements List interface like ArrayList, Vector, and LinkedList but its a thread-safe collection and it achieves its thread-safety in a slightly different way than Vector or other thread-safe collection class. CopyOnWriteArrayList is a concurrent Collection class introduced in Java 5 Concurrency API along with its popular cousin ConcurrentHashMap in Java.
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