Skip to Main Content

Java APIs

Announcement

For appeals, questions and feedback about Oracle Forums, please email oracle-forums-moderators_us@oracle.com. Technical questions should be asked in the appropriate category. Thank you!

Interested in getting your voice heard by members of the Developer Marketing team at Oracle? Check out this post for AppDev or this post for AI focus group information.

Return an object of the same type as method's parameter

843793Apr 22 2010 — edited Apr 23 2010
Hi,

Is it possible to do something like that?
public <T, E> T<E> method(T<E> arg) {    
    T<E> copy = arg.getClass().newInstance();
    return copy;
}
The method should create and return generic object on the basis of parameter's type. I would like to operate on Collection<E> without worrying about actual type of collection (List, Set...).

method(new ArrayList<Something>) should return ArrayList<Something>
method(new HashSet<Something>) should return HashSet<Something>
and so on.

Cheers

Comments

Locked Post
New comments cannot be posted to this locked post.

Post Details

Locked on May 21 2010
Added on Apr 22 2010
3 comments
170 views