Jaquarh :
I am trying to create an array list of Libraries my application uses to create an instance of. I have an abstract class which they extend so I can use the same Class<T>
abstract class Library {}
abstract class SomeLib extends Library {}
I now want to create this array list, this is how I am trying to do it:
public ArrayList<Class<Library>> libs = new ArrayList<Class<Library>>(
Arrays.asList(SomeLib.class)
);
However, I get this error:
Cannot resolve constructor 'ArrayList(java.util.List)`
What am I doing wrong?
Johannes Kuhn :
As I already said in the comments, use ArrayList<Class<? extends Library>>.
The reason for this is simple: SomeLib.class has the type Class<SomeLib>, which is not a Class<Library>.
But if you make the generic a bit looser, by allowing it's subclasses (as you want to do), then Class<SomeLib> matches Class<? extends Library>, and everything works fine.
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