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: it has no fields and references no fields from other classes.

The state for a particular computation exists solely in local variables that are stored on the thread’s stack and are accessible only to the executing thread.

One thread accessing a method/class cannot influence the result of another thread accessing the same method/class; because the two threads do not share state, it is as if they were accessing different instances.

Since the actions of a thread accessing a stateless object cannot
affect the correctness of operations in other threads, Stateless objects are threadsafe.