How do I use synchronized collections in Java?

How do I use synchronized collections in Java?

Synchronized collections in Java are used to ensure thread safety. You can use methods like Collections.synchronizedList() to create a synchronized version of a collection.

Can you give me an example of using a synchronized list?

Sure! Here's a simple example:

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

synchronized (syncList) {
    syncList.add("Hello");
    syncList.add("World");
}

This ensures that the list is thread-safe when accessed by multiple threads.

What happens if I don't use synchronization?

If you don't use synchronization, you may encounter issues like data inconsistency or ConcurrentModificationException when multiple threads access the collection simultaneously.

Are there any alternatives to synchronized collections?

Yes, you can use concurrent collections like CopyOnWriteArrayList or ConcurrentHashMap, which are designed for concurrent access without needing explicit synchronization.