What is difference between concurrent hashmap and hashmap?

Question

Accepted Answer

ConcurrentHashMap allows multiple threads to read/write concurrently, while HashMap is not thread-safe.

ConcurrentHashMap allows multiple threads to read/write concurrently without blocking each other.
HashMap is not thread-safe and can lead to data corruption if accessed by multiple threads simultaneously.
ConcurrentHashMap achieves thread-safety by using internal synchronization mechanisms like locks or CAS operations.
HashMap does not provide any internal synchronization, so external synchronization is needed to make it thread-safe.
ConcurrentHashMap is part of the java.util.concurrent package, while HashMap is part of the java.util package.

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