Synchronized Map In Java

Synchronized method is used to lock an object for any shared resource. But is it possible that thread b gets an entry, then thread a updates the value, and then thread b deletes the value because it matches some condition, but it shouldn't have because of the value thread a updated it to. According to oracle docs, in order to synchronize hashmap we need to use collections.synchronizedmap (hashmap).

If multiple threads access a hash map concurrently, and at least one of the threads modifies the map structurally, it must be synchronized externally to avoid an inconsistent view of the contents. Java synchronized method if you declare any method as synchronized, it is known as synchronized method. This is a better solution than synchronized method.

We could use it for easily creating a synchronized map.

A map providing thread safety and atomicity guarantees. Synchronized map, java, collection similar programs chapter last updated; My understanding is that a synchronized map will block access. This is a better solution than synchronized method.