In Java, do I need to declare my collection synchronized if it's read-only?

Question

I fill a collection one single time when my J2EE webapp starts. Then, several thread may access it at same time but only to read it.

I know using a synchronized collecti

Answer 1

You do not have to, as explained in other answers. If you want to ensure that your collection is read only, you can use:

yourCollection = Collections.unmodifableCollection(yourCollection);

(similar method exist for List, Set, Map and other collection types)