Does immutability guarantee thread safety?

Question

Well, consider the immutable class Immutable as given below:

public final class Immutable
{
    final int x;
    final int y;
    public Immutable(i         


        

Answer 1

So, Thread B could see the write to objas occurring before the writes to the fields of the Immutable. Hence Thread B could thus see a partially constructed Immutable that may well be in an invalid state and whose state may unexpectedly change later.

In Java 1.4, this was true. In Java 5.0 and above, final fields are thread safe after construction.