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Currently there is a poll on http://www.java.net
"What one feature would you most like to see in JDK 7"
Closures are one possible choice. Closures would be soooo niiiiiiiice. Here is why:
List cats = database.query( { Cat cat => cat.getName().equals("Wolke") } );
Can Native Queries be more beautiful?
This is a cry to the db4o community:
Please vote for closures!
Some further links on closures:
http://www.javac.info/closures-v04.html
http://www.bejug.org/confluenceBeJUG/display/PARLEYS/Closures+for+Java
http://gafter.blogspot.com/2006/12/closures-talk-and-spec-update.html