SynchronizedMap vs ConcurrentHashMap: Which to Use?

What are the main differences between SynchronizedMap and ConcurrentHashMap?

SynchronizedMap is a wrapper around a Map that synchronizes access, while ConcurrentHashMap allows concurrent access without locking the entire map.

When should I use ConcurrentHashMap instead of SynchronizedMap?

Use ConcurrentHashMap when you need high concurrency and performance, as it allows multiple threads to read and write simultaneously.

Are there any performance implications of using SynchronizedMap?

Yes, SynchronizedMap can lead to performance bottlenecks due to its locking mechanism, especially under high contention.

Can you give an example of when to use each?

Use SynchronizedMap for simple use cases with low contention, and ConcurrentHashMap for high-performance applications with many threads.