Accessing Private Members with Cin inside Class

I'm little confused.. My Code is Below

#include <iostream>
using namespace std;
class Test {
    private:
    int x, y;
  public:
    void get(){
        cin>>x;
        cin >>y;
        cout << x;
        cout << y;
    }
};

int main ()
{
  Test obj;
  obj.get();
  return 0;
}

In this code I'm accessing private members using cin..!! Is it fine? because I think user can send values or access private members directly after program run..!!