What is the difference between Synchronized and ConcurrentHashMap in Java?

What is the difference between Synchronized and ConcurrentHashMap in Java?

Synchronized is a method of synchronizing access to a single object, while ConcurrentHashMap allows concurrent access to multiple threads without locking the entire map.

When should I use ConcurrentHashMap instead of Synchronized?

You should use ConcurrentHashMap when you need high concurrency and performance, as it allows multiple threads to read and write without blocking each other.

Are there any performance drawbacks to using Synchronized?

Yes, Synchronized can lead to performance bottlenecks due to thread contention, especially in high-concurrency scenarios.

Can you give an example of how to use ConcurrentHashMap?

Sure! Here's a simple example: ConcurrentHashMap<String, Integer> map = new ConcurrentHashMap<>(); map.put("key1", 1); This allows safe concurrent access.