How can I ensure thread safety when using ArrayList in Java?

How can I ensure thread safety when using ArrayList in Java?

To ensure thread safety with ArrayList, you can use the synchronizedList method from the Collections class.

Can you show me an example of how to use synchronizedList?

Sure! Here's a simple example:

List<String> synchronizedList = Collections.synchronizedList(new ArrayList<>());

This wraps the ArrayList in a synchronized list.

Are there any performance implications of using synchronizedList?

Yes, using synchronizedList can lead to performance overhead due to synchronization. For high concurrency, consider using CopyOnWriteArrayList.

What is CopyOnWriteArrayList?

CopyOnWriteArrayList is a thread-safe variant of ArrayList where all mutative operations are implemented by making a fresh copy of the underlying array.