Re: What does this error description mean?
Ravi wrote, quoted or indirectly quoted someone who said :
warning: [unchecked] unchecked call to
LinkedList(java.util.Collection) as a member of the raw type
java.util.LinkedList
Roedy Green wrote:
see http://mindprod.com/jgloss/generics.html
You need a lot of background to understand what you have to do to fix
it.
Not so much background is needed for this particular error. All you have to
do is add the '<Integer>' to the 'List' instantiation to make sure both sides
match.
That much background is obtained simply by reading the link Eric provided
<http://java.sun.com/docs/books/tutorial/java/generics/index.html>
or the mindprod.com link referenced above, or the free PDF from Joshua Bloch's
/Effective Java/ on generics available from the java.sun.com site
<http://java.sun.com/docs/books/effective/generics.pdf>
or any of the IBM Developerworks or other resources found from
<http://www.google.com/search?q=Java+generics+introduction>
People act like generics is so hard to get. It's more like checkers - there
aren't that many rules to get a basic understanding, although mastery does
require deep study. Sort of like the Java language itself.
OTOH, computer programming generally requires a lot of background to
understand what you have to do. Too many people plunge into the discipline
with a scattershot approach, throwing things into source code in blind hope
that they'll get what they want. Programming requires study, thought and
understanding for one to be effective. Trying to learn solely by asking the
newsgroup is no substitute; one absolutely must develop the habit and skill of
looking things up and figuring them out.
--
Lew