What kind of class invariants does C++ guarantee which Java fails to, and with what impact?

Answer by Sergey Zubkov:

In Java, no class invariants are guaranteed at the entry to an overriding instance method, because it may be called before initialization of its object begins. C++ guarantees all class invariants in a well-defined program.

What kind of class invariants does C++ guarantee which Java fails to, and with what impact?

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