What happens is that the default toString()
method of your class is getting used. This method is defined as follows:
The
toString
method for classObject
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())
The value returned by the default hashCode()
method is implementation-specific:
As much as is reasonably practical, the
hashCode
method defined by classObject
does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the JavaTM programming language.)