Why does the default Object.toString() include the hashcode?

Question

If you execute:

System.out.println(someObj.toString());

you probably see the output like

someObjectClassname@hashcod

Answer 1

From the javadocs:

As much as is reasonably practical, the hashCode method defined by class Object 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.)

The hashCode appears in the string representation of the object so that you can distinguish this object from other objects of the same class. This can be useful for debugging.