A synchronized method is a method marked with the synchronized keyword, meaning it can only be accessed by one thread at a time. If
multiple threads try to access the synchronized method simultaneously, they will be blocked until the method is available.
Synchronized methods prevent race conditions and data inconsistencies in multi-threaded environments. Ensuring that only one thread can access a
method at a time, prevents multiple threads from modifying the same data simultaneously, and causing conflicts.
When one part of a getter/setter pair is synchronized the other should be too. Failure to synchronize both sides may result in
inconsistent behavior at runtime as callers access an inconsistent method state.
This rule raises an issue when either the method or the contents of one method in a getter/setter pair are synchronized, but the other is not.
