Why are singleton objects more object-oriented?

Question

In Programming in Scala: A Comprehensive Step-by-Step Guide, the author said:

One way in which Scala is more object-oriented than Java is that cla

Answer 1

It's a marketing thing, really. Consider two examples:

class foo
   static const int bar = 42;
end class

class superfoo
    Integer bar = ConstInteger.new(42);
end class

Now, what are the observable differences here?

• in a well-behaved language, the additional storage created is the same.
• Foo.bar and Superfoo.bar have exactly the same signatures, access, and so on.
• Superfoo.bar may be allocated differently but that's an implementation detail

It reminds me of the religious wars 20 years ago over whether C++ or Java were "really" Object Oriented, since after all both exposed primitive types that aren't "really" objects -- so, for example you can't inherit from int but can from Integer.