How to create instance of class File?

I've taken a class file(say Foo.class) using JFileChooser and stored it in a File class object(say File a). now I've to read metadata like methods and variables of this Foo.class using reflection APIs. My question is that, I've stored it in a, which is just a File reference variable. So how can I use any API on a File. or any other suggestion for doing so are also welcomed.