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Consider a for-loop over a function that takes an ArrayList reference and adds an object to that ArrayList. I would now like to execute each function call in parallel.
Is the ArrayList.add() method thread safe if I don't care about the sequence the objects are added and no function reads or manipulates any ArrayList elements? So I only want to make sure that at the end of the parallel call all objects are added to the list.
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ArrayList , on the other hand, is unsynchronized, making them, therefore, not thread safe. With that difference in mind, using synchronization will incur a performance hit. So if you don't need a thread-safe collection, use the ArrayList .
The ArrayList in java does not provide the checks for duplicate references to the same object. Therefore, we can insert the same object or reference to a single object as many times as we want.
We know that by default ArrayList class is not a thread-safe or non-synchronized. That means the multiple threads can access the same ArrayList object or instance simultaneously. Therefore, it cannot be used in the multi-threading environment without explicit synchronization.
Method 2: Using CopyOnWriteArrayList It is a thread-safe variant of ArrayList.
No, it's not thread-safe. Wrap your list using Collections.synchronizedList(), or use explicit synchronization when accessing the list.
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