Fail-Safe Vs Fail-Fast Iterator Inward Java
Difference betwixt fail-safe together with fail-fast Iterator is becoming favorite total coffee interview questions solar daytime past times day, reason
it touches concurrency a fleck together with interviewee tin transcend deep on it to inquire how fail-safe or fail-fast demeanour is implemented.
In this article article nosotros volition come across what is fail-safe together with neglect fast iterators inwards java together with differences betwixt fail-fast together with fail-safe iterators . Concept of fail-safe iterator are relatively novel inwards Java together with start introduced amongst Concurrent Collections inwards Java five similar ConcurrentHashMap together with CopyOnWriteArrayList.
Difference betwixt fail-fast Iterator vs fail-safe Iterator inwards Java
fail-fast Iterators inwards Java
As refer propose fail-fast Iterators neglect equally presently equally they realized that structure of Collection has been changed since iteration has begun. Structural changes way adding, removing or updating any chemical constituent from collection spell ane thread is Iterating over that collection. fail-fast demeanour is implemented past times keeping a modification count together with if iteration thread realizes the alter inwards modification count it throws ConcurrentModificationException. Java MD says this is non a guaranteed demeanour instead its done of "best examine basis", So application programming tin not rely on this behavior. Also since multiple threads are involved spell updating together with checking modification count together with this check is done without synchronization, at that topographic point is a run a hazard that Iteration thread even together with thus sees a stale value together with mightiness non move able to uncovering whatever alter done past times parallel threads. Iterators returned past times most of JDK1.4 collection are fail-fast including Vector, ArrayList, HashSet etc. to read to a greater extent than most Iterator come across my post 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 ane thread is Iterating over it because they operate on clone of Collection instead of master collection together with that’s why they are called equally fail-safe iterator. Iterator of CopyOnWriteArrayList is an representative of fail-safe Iterator likewise iterator written past times ConcurrentHashMap keySet is likewise fail-safe iterator together with 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 speedily becoming popular coffee collection questions asked on diverse degree of coffee interview. Let me know if you lot are aware of whatever other divergence betwixt fail-fast together with fail-safe iterator.
Further Learning
Java In-Depth: Become a Complete Java Engineer
Why multiple Inheritance is non supported inwards Java
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