asked on 7/18/2008

Little Help with jdom and Generics

Eclipse has been complaining about the type safety of a line in my code that I can't seem to fix. According to the jdom javadoc(http://www.jdom.org/docs/apidocs/), it's method signature is: public java.util.List getChildren(). So since it is a collection of Elements I figured I had it covered...but no.

Can another set of eyes spot what I am missing, or is it just a bug of some kind?

Thanks in advance.

--Charly

List<Element> lines = xmlDoc.getRootElement().getChild("productionLines")
			.getChildren("productionLine");

Last Comment

7/18/2008

7/18/2008

try:

List<?> lines = xmlDoc.getRootElement().getChild("productionLines")
.getChildren("productionLine");

or just:

List lines

dleehanson

7/18/2008

ASKER

When I don't have anything at all, just List lines, it complains that it is a raw type and needs to be parameterized. When I tried List<?> lines the warning went away, but my next line of code where I loop through the List of lines broke. What is the ? in the parameter field? Some kind of wildcard?

List lines = xmlDoc.getRootElement().getChild("productionLines")
			.getChildren();
		
for(Element someLine : lines)
{
}

Open in new window

Mick Barry

7/18/2008

it says its a list of objects of unknown type. So you'll need to cast in your loop

If a method doesn't define explicitly what it reurns then you cannot make assumptions (as the compiler just goes on how things are defined)

dleehanson

7/18/2008

ASKER

So if I leave it as just List, and cast it as an Element in my loop (which I can't get to work), won't that still give me the generics raw type warning I am trying to avoid? Am I missing something?

In the documentation it says that it returns a List of Element objects, but it must not be explicitly defined that way eh...

Thanks for the help and the quick replies!

ASKER CERTIFIED SOLUTION

Mick Barry

7/18/2008

THIS SOLUTION IS ONLY AVAILABLE TO MEMBERS.

View this solution by signing up for a free trial.

Members can start a 7-Day free trial and enjoy unlimited access to the platform.

See Pricing Options

Start Free Trial

dleehanson

7/18/2008

ASKER

Ok. Thanks!