Java Puzzle : Function parameters

Here is another Java puzzle, but this time you don’t need to find output of this program. Instead just complete the code snippet to get desired output.

Here is the program :

public class OPuzzle {
    public static void main(String[] args) {
        Object o = null;
        printMe(o);
    }
    
    private static void printMe(<Provide the declaration here> o){
        if(o!=null){
            System.out.println("I am not null");
        }
    }
}

Desire output :

I am not null

Replace the <Provide the declaration here> with appropriate declaration to get above desired output. Leave your comments.

Reference : http://google-opensource.blogspot.com/2011/04/geek-time-with-josh-bloch.html 

No no no … don’t see reference before solving :).