Re: ArrayList called with specific object constructors
On 29 Apr, 02:59, Lew <no...@lewscanon.com> wrote:
Alessandro wrote:
The idea is that you want to be able to use a factor of Integers (e.g.=
)
to fill a list of Numbers. The other way of doing this is to do this:
public <T> List<? super T> makeList(Factory<T> factory)
That's clear, but I have problems with calling the interface Factory.
Still viewed Robert code but it can't work because instantiating an
interface.
You don't instantiate interfaces. You instantiate a concrete class and=
assign
its reference to an interface-typed variable.
This is my edited fragment:
//START
*** Factory interface ***
public interface Factory<T> {
public T makeObject(String s1, String s2);
}
*** class calling generic method (implements Factory ??? implements
Factory<T> ???***
...
ArrayList<Ric> ricList=xmlService.xml2ListGEN(new Factory<Ric>());
Nope. Instead of 'new Factory <Ric>()' try something like Robert Klemm=
e's
anonymous class trick, or define a named class like:
public class RicFactory implements Factory <Ric>
{
public Ric makeObject( String s1, String s2 )
{
return new Ric( s1, s2 );
}}
====
List <Ric> rics = makeList( new RicFactory() );
...
--
Lew
Hi Lew,
thanks for your code, I have solved !
Thanks also to the other people who have answered.
Alessandro
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