Fail-Safe Vs Fail-Fast Iterator Inward Java
Difference betwixt fail-safe in addition to fail-fast Iterator is becoming favorite heart coffee interview questions solar daytime yesteryear day, reason
it touches concurrency a chip in addition to interviewee tin flaming overstep deep on it to inquire how fail-safe or fail-fast direct is implemented.
In this article article nosotros volition come across what is fail-safe in addition to neglect fast iterators inwards java in addition to differences betwixt fail-fast in addition to fail-safe iterators . Concept of fail-safe iterator are relatively novel inwards Java in addition to start introduced alongside Concurrent Collections inwards Java five similar ConcurrentHashMap in addition to CopyOnWriteArrayList.
Difference betwixt fail-fast Iterator vs fail-safe Iterator inwards Java
fail-fast Iterators inwards Java
As mention advise fail-fast Iterators neglect equally shortly equally they realized that structure of Collection has been changed since iteration has begun. Structural changes agency adding, removing or updating any chemical constituent from collection piece i thread is Iterating over that collection. fail-fast direct is implemented yesteryear keeping a modification count in addition to if iteration thread realizes the alter inwards modification count it throws ConcurrentModificationException. Java MD says this is non a guaranteed direct instead its done of "best try basis", So application programming tin flaming not rely on this behavior. Also since multiple threads are involved piece updating in addition to checking modification count in addition to this check is done without synchronization, at that topographic point is a run a hazard that Iteration thread all the same sees a stale value in addition to mightiness non hold upward able to honour whatever alter done yesteryear parallel threads. Iterators returned yesteryear most of JDK1.4 collection are fail-fast including Vector, ArrayList, HashSet etc. to read to a greater extent than nigh Iterator come across my postal service What is Iterator inwards Java.
fail-safe Iterator inwards java
Contrary to fail-fast Iterator, fail-safe iterator doesn't throw whatever Exception if Collection is modified structurally
while i thread is Iterating over it because they function on clone of Collection instead of master copy collection in addition to that’s why they are called equally fail-safe iterator. Iterator of CopyOnWriteArrayList is an illustration of fail-safe Iterator too iterator written yesteryear ConcurrentHashMap keySet is too fail-safe iterator in addition to never throw ConcurrentModificationException inwards Java.
That’s all on difference betwixt fail-safe vs fail-fast Iterator inwards Java, As I said due to at that topographic point confusing or non to tardily differentiation they are rapidly becoming popular coffee collection questions asked on diverse score of coffee interview. Let me know if you lot are aware of whatever other departure betwixt fail-fast in addition to fail-safe iterator.
Further Learning
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