import java.util.ArrayList;
import java.util.Collection;
import java.util.List;


public class ExploringGenerics {

    public static final void processCollectionQuest(Collection<?> data) {
        System.out.println(data.size());
    }

    public static final void processCollectionObject(Collection<Object> data) {
        System.out.println(data.size());
    }

    public static void main(String[] args) {
        List<String> mine = new ArrayList<>();
        mine.add("Hello");

        -- the following will not compile
        processCollectionObject(mine);

        -- the following will compile.
        processCollectionQuest(mine);

    }
}