As we are aware that ArrayList is non-synchronized and should not be used in multi-thread environment without explicit synchronization. This post is to discuss how to synchronize ArrayList in Java. There are two ways to synchronize explicitly: Using thekeep.onlineonizedList() method; Using thread-safe variant of ArrayList: CopyOnWriteArrayList. In java, most used data structure is probably a list. A list has an undetermined number of elements and you can add, read, or remove the element of any position. Additionally, concurrent lists allow the various threads to add or remove elements in the list at a time without producing any data. Jan 09,  · In fact, all collection classes (except Vector and Hashtable) in the thekeep.online package are not thread-safe. The only two legacy collections are thread-safe: Vector and Hashtable.

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Advanced Java: Multi-threading Part 8 - Wait and Notify, time: 10:22

My thread pool has a fixed number of threads. These threads need to write and read from a shared list frequently. So, which data structure (it better be a List, must be monitor-free) in thekeep.online If another thread updates list while it is being added, the you are liable to get a ConcurrentModificationException. If you need to do the addAll(list) in a thread-safe fashion in the face of concurrent updates to list, then you need to make list a CopyOnWriteArrayList. May 01,  · No iterator is thread-safe. If the underlying collection is changed amidst iteration, a ConcurrentModificationException is thrown. Even iterators of synchronized collections are not thread-safe - you have to synchronize manually. One exception is the CopyOnWriteArrayList, which holds a snapshot during iteration. Jan 09,  · In fact, all collection classes (except Vector and Hashtable) in the thekeep.online package are not thread-safe. The only two legacy collections are thread-safe: Vector and Hashtable. Feb 11,  · When you give your list to another thread by thread-safe means (for example using a synchronized block, a volatile variable or an AtomicReference), it is guaranteed that the second thread sees the whole list in the state it was when transferring (or any later state, but not an earlier state). Dec 12,  · I want to add items to a list from one thread and from another thread remove items from the same list. However, I am not sure if I will run into problems with multiple threads accessing the same object. I have read a bit on the lock statement but I am not sure how to implement this. In java, most used data structure is probably a list. A list has an undetermined number of elements and you can add, read, or remove the element of any position. Additionally, concurrent lists allow the various threads to add or remove elements in the list at a time without producing any data. As we are aware that ArrayList is non-synchronized and should not be used in multi-thread environment without explicit synchronization. This post is to discuss how to synchronize ArrayList in Java. There are two ways to synchronize explicitly: Using thekeep.onlineonizedList() method; Using thread-safe variant of ArrayList: CopyOnWriteArrayList.Don't use an ArrayList, instead use a suitable class such as CopyOnWriteArrayList. However if there are a lot of modifications (and big lists), . A thread-safe variant of ArrayList in which all mutative operations (e.g. add, set, remove..) are implemented by creating a separate copy of underlying array. I remove the TouchPoint from the active list and move it back over to the . Unlike ArrayList, the class itself is thread-safe so you don't need to. Definitely not! While using the ReadWriteLock pattern instead of simple intrinsic locking for collections is a good thing to do, you are doing. This method returns a synchronized thread-safe list backed by the specified list. No explicit synchronization is needed to add, remove elements from. -

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