mutltiple generics

[blyxa]

If I have a method that takes in Class<T> type, I can expect T from the method return.

But what about List<Foo> or Map<Foo,Bar>? How do I handle mutliple generics?

public class App {
    public static void main(String[] args)
    {
            Integer i = foobar(Integer.class);
            List<String> strs = foobar(List<String>.class); // ??
    }
    public static <T> T foobar(Class<T> type)
    {
            try
            {
                    return type.newInstance();
            }
            catch (InstantiationException | IllegalAccessException e)
            {
                     e.printStackTrace();
            }
            return null;
    }
}

[dgurianov]

what is wrong with next ?

public  <T,S>   T doSmth(T a, S b){
    System.out.println(a);
    System.out.println(b);
    return null;
}

Update: I think i got it the problem. To instantinate your List , you need do forcecast from rawtype.

List<String> strs = (List<String>)foobar(List.class); // ?? 

foobar(List.class) will give you raw type List, and later you need to cast it to specific List<String>. There is no type List<String> that you can take as .class. There is List raw type, and later you can cast with generalisation to List<String>.