How do I identify immutable objects in Java

Question

In my code, I am creating a collection of objects which will be accessed by various threads in a fashion that is only safe if the objects are immutable. When an attempt is m

Answer 1

This could be another hint:

If the class has no setters then it cannot be mutated, granted the parameters it was created with are either "primitive" types or not mutable themselves.

Also no methods could be overriden, all fields are final and private,

I'll try to code something tomorrow for you, but Simon's code using reflection looks pretty good.

In the mean time try to grab a copy of the "Effective Java" book by Josh Block , it has an Item related to this topic. While is does not for sure say how to detect an inmmutable class, it shows how to create a good one.

The item is called: "Favor immutability"

link: http://java.sun.com/docs/books/effective/