Printing Array using Method in java pgm

Printing Array using Method

import java.util.ArrayList;

import java.util.Vector;

public class Main 

{

public static void main(String[] args) 

 {

   Object testObject = new ArrayList();

      displayObjectClass(testObject);

   }

   public static void displayObjectClass(Object o) 

  {

      if (o instanceof Vector)

      System.out.println("Object was an instance 

      of the class java.util.Vector");

      else if (o instanceof ArrayList)

      System.out.println("Object was an instance of 

      the class java.util.ArrayList");

      else

      System.out.println("Object was an instance of the " + o.getClass());

   }

}