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Default virtual behavior in C++ vs Java
In C++ methods are non-virtual by default. They can be made virtual function by using a virtual keyword.
Example Code
#include <iostream>
using namespace std;
class B {
public: void s() //non virtual by default. Use virtual before the function to print “In Derived” {
cout<<" In Base \n";
}
};
class D: public B {
public: void s() {
cout<<"In Derived \n";
}
};
int main(void) {
D d; // An object of class D
B &b = d;
b.s();
return 0;
}Output
In Base.
In Java, methods are virtual by default. They can be made non-virtual function by using the final keyword.
Example Code
class B {
public void s() {
System.out.println("In Base"); // virtual by default
}
}
class D extends B {
public void s() {
System.out.println(" In Derived");
}
}
public class Main {
public static void main(String[] args) {
B b = new D();
b.show();
}
}Output
In Base.
Updated on: 30-Jul-2019
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