请说出 E类中【代码 1】和【代码 2】的输出结果。interface A {double f(double x, double y);}class B implements A {publ ic double f(double x, double y){return x* y;}int gl int a, int b){return a t b;}}public class E {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】 }}