What is Stateless Object in Java?

Question

Currently I\'m reading \"Java concurrency in practice\", which contains this sentence:

Since the action of a thread accessing a stateless object can\'

Answer 1

Just a clarification. You can consider your class as stateless in the way that is stated before, even when it has an instance variable as far as this variable is final AND immutable.

If the instance variable is just final but mutable, a List of Strings in example, yes the variable's reference can not be changed but the contents of the List and thus the state of the class can be changed.