It depends on the type of Object. All Objects inherit a toString() and some have been overridden to return very meaningful representations of the data such as ArrayList class which return lists of elements in an array.
The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:
getClass().getName() + '@' + Integer.toHexString(hashCode()) [ December 06, 2005: Message edited by: Scott Selikoff ]