Java array synchronization

Question

I have an async task management class that has an array like this:

public static int[][][] tasks;

I basically refer to the cells as follows:

synchronized(tasks[A][B]) {
  // Doing something with tasks[A][B][0]
}

My question is: if I do this:

synchronized(tasks[A]) {
  // ...
}

will it also block threads trying to enter synchronized (tasks [A] [B])? In other words, synchronized array access also syncs accsess with its cells? If not, how do I block an array of WHOLE tasks [A] for my thread?


Edit: the answer is NO. When someone is in the synchronized block for tasks [A], someone can be in the synchronized block for tasks [A] [B] at the same time, for example, because it is a different object. Therefore, when it comes to accessing objects from one place at a time, arrays do not differ: touch an object X from one place at a time, when you need to surround it with synchronized (X) ALL, you touch it.

Answer 1

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Answer 2

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