Synchronization in Vectors in Java

Question

what is meant by vector in Java is thread safe and synchronized, how is it made thread safe. I\'m looking at internal details of implementation

Answer 1

Please find the below excerpts from java api

First, it is not possible for two invocations of synchronized methods on the same object to interleave. When one thread is executing a synchronized method for an object, all other threads that invoke synchronized methods for the same object block (suspend execution) until the first thread is done with the object.

Second, when a synchronized method exits, it automatically establishes a happens-before relationship with any subsequent invocation of a synchronized method for the same object. This guarantees that changes to the state of the object are visible to all threads.