Invoking virtual method in constructor: difference between Java and C++

In Java: class Base { public Base() { System.out.println("Base::Base()"); virt(); } void virt() { System.out.println("Base::virt()"); } } class Derived extends Base { public Derived() { System.out.println("Derived::Derived()"); virt(); } void virt() { System.out.println("Derived::virt()"); } } public class Main { public static void main(String[] args) { new Derived(); } } This will output Base::Base() Derived::virt() Derived::Derived() Derived::virt() However, in C++ the result is different: Base::Base() Base::virt() // ← Not Derived::virt() Derived::Derived() Derived::virt() (See for C++ code) What causes such a difference between Java and C++? Is it the time when vtable is initialized? **EDIT:** I do understand Java and C++ mechanisms. What I want to know is the insights behind this design decision.

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