Should I get a warning!

Question

Hi,
I am working through a document on generics, j-generics-a4.pdf that I downloaded from the IBM site. It says that the following code should produce a warning when compiled.
import java.util.*;
public class Generics6
  static void print(List l)
    for(Object o : l)
      System.out.println(o);
  public static void main(String[] args)
    List<String> ls = new ArrayList<String>();
    ls.add("one");
    ls.add("two");
    print(ls);
    List<Integer> li = new ArrayList<Integer>();
    li.add(new Integer(123));
    li.add(new Integer(321));
    print(li);
}I am using JDK 5.0 and do not get any warnings or exceptions Should I? The artical says that "if you call print() with a List<Integer> object you should get a warning because your passing a generic type to a method that only promises to treat it as a List (a so-called raw type), which could undermine the type safety of using generics." Is this correct?
Regards FarmerJo

Answer 1

I believe the tutorial is wrong, the java compiler is smarter than that. The printlist method have no way of "undermine the type safety"... Try to insert a call to l.add() and you'll get all the warnings you want!
Anyway I don't know it for sure. I'll check on docs...