请写出下面程序中【代码】的输出结果interface A {double f(double x,double y);}class B implements A {public double f(double x,double y) {return x*y;}int g(int a,int b) {return a+b;}}public class Main {public static void main(String args[]) {A a = new B();System.out.println(a.f(3,5)); //【代码1】B b = (B)a;System.out.println(b.g(3,5)); //【代码2】}}