Java concurrency: is final field (initialized in constructor) thread-safe?

Question

Can anyone tell me whether this class is threadsafe or not ?

class Foo {

    private final Map aMap;

    public Foo() {
        aMap =         


        

Answer 1

Guava has immutable classes for making this sort of thing easier and guaranteed immutable:

private final ImmutableMap aMap = ImmutableMap.of(
    "1", "a",
    "2", "b",
    "3", "c");