Are Java collections safe if they are read but not modified in multiple threads?

Question

Is it possible to use the standard Collections classes (as opposed to the simultaneous ones) if I guarantee that the code does not modify the data in multiple threads. The code I'm talking about is completely under my control, and I don't mutate it after the initial (single-threaded) phase of the population.

I know that some classes, such as DateFormat, are not thread safe because they store intermediate states as they are used. Are collections (ArrayList, Tree Map, etc.) safe though?

Answer 1

, , , . , , ( Collections.unmodifiableList) ( , , ).

Answer 2

. API Java , , , TreeMap:

, . , , . (A - , ; , .)

. , , .

Answer 3

, ( ) .

, , , , .

Answer 4

, :

• Multiple threads (as you wrote).
• The same thread in the current opening of Iterration.

If you check these two, you can use standard collections.

Sincerely.