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Is it required to synchronize write access to an array in Java if each thread writes to a separate cell space?
EDIT: Specifically, the array is either a primitive Array or an immutable object array. Ex. An int array or a String array.
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Synchronization in java is the capability to control the access of multiple threads to any shared resource. In the Multithreading concept, multiple threads try to access the shared resources at a time to produce inconsistent results. The synchronization is necessary for reliable communication between threads.
We can use Collections. synchronizedList(List<T>) method to synchronize collections in java. The synchronizedList(List<T>) method is used to return a synchronized (thread-safe) list backed by the specified list.
In Java, each object has a lock or a monitor. This lock can be accessed by a thread. At a time only one thread can acquire this monitor or lock. Java programming language provides a keyword Synchronized' that allows us to synchronize the threads by making a block or method as Synchronized.
No, synchronization is not needed.
It is defined in JLS §17.6 Word Tearing:
One implementation consideration for Java virtual machines is that every field and array element is considered distinct; updates to one field or element must not interact with reads or updates of any other field or element. In particular, two threads that update adjacent elements of a byte array separately must not interfere or interact and do not need synchronization to ensure sequential consistency.
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