C++ vs Java constructors

Question

According to John C. Mitchell - Concepts in programming languages,

[...] Java guarantees that a constructor is called whenever an object is created.

Answer 1

Java can actually allocate objects without(!) calling any constructor.

If you browse the sources of ObjectInputStream you will find that it allocates the deserialized objects without calling any constructor.

The method which allows you to do so is not part of the public API, it is in a sun.* package. However, please don't tell me it is not part of the language because of that. What you can do with public API is put together the byte stream of a deserialized object, read it in and there you go with an instance of the object whose constructor was never called!