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

Stateless object is an instance of a class without instance fields (instance variables). The class may have fields, but they are compile-time constants (static final).

A very much related term is immutable. Immutable objects may have state, but it does not change when a method is invoked (method invocations do not assign new values to fields). These objects are also thread-safe.