Referring To Overridden Method From Supertype Reference?

If a method is overridden but you use a polymorphic (supertype) reference to refer to the subtype object with the overriding method, the compiler assumes you're calling the supertype version of the method.

is this true? maybe i'm misunderstanding it, but i thought the JVM looks at the object at run time and checks the object type. the context of the quote is about checked exceptions, but it seems like the statement should stand regardless of context. but this doesn't back up my experience. for example:

public class Test{
public void print(){
System.out.println("Super");
} public static void main(String[] args){
Test t = new SubTest();

[Code] ....

Will invoke the subclass method. like i said, maybe i'm missing something.