![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-56/ti_inject-812ce.png)
请说出 E 类中【代码 1 】,【代码 2 】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 E { public static void main(String args[]) { A a = new B(); System.out.println(a.f(3,5)); // 【代码 1输出:_______ 】 B b = (B)a; System.out.println(b.g(3,5)); // 【代码 2输出:_______ 】 } }