I have a two part question

> 
> My book states this "If the wildcard is specified without an upper
>  bound, then only the methods of type Object can be invoked on the
>  values of the wildcard type"
> 
> 
> 

**I have no idea what this could mean. What does this mean?**

Also what are the limitations place on wild card types (unbounded and bounded)? For instance if I have a reference to `MyClass<?>` or `MyClass<? extends SomeOtherClass>`, what methods am I not allowed to call through that reference. I don't understand what the wild card **allows or disallows** me to do, which is probably why I don't understand the quote from the book.

I have an example for the second part:

```
class SomeOtherClass
{
[...]
}

class MyClass<T>
{
[...]
}

class Test
{
     public static void main(String[] arg)
     {
         MyClass<? extends SomeOtherClass> myClass = new MyClass<String>() // for instance what does the wild card reference limit me to in any way. In a general sence.
     }
}

```