Can not convert from element type Object to Session

Question

private static final Set sessions = Collections.synchronizedSet(new HashSet());

I am storing sessions in a Set type reference variable called sessions s shown above.

Now, I want to iterate over these:

for(Session s : sessions){}

However, I get a Type Mismatch error at it that says

Can not convert from element type Object to Session

How do I fix this ?

you can do this too. `for(Session s : (Set)sessions){}` – Jafar Ali Apr 06 '15 at 10:08 — Jafar Ali, Apr 06 '15 at 10:08

score 3 · Accepted Answer · edited May 23 '17 at 11:50

3

TL;DR: DON'T USE RAWTYPES

You are using a raw Set, this means that the compiler can only know that your Set contains Object.

You need to specify the generic type of your collection:

Set<Session> sessions = Collections.synchronizedSet(new HashSet<>());

For more information, read this.

edited May 23 '17 at 11:50

Community

answered Apr 05 '15 at 13:10

Boris the Spider