java中如何生成一个接口，可以让别人调用这个接口获取响应的数据，求速解大神（希望能有个例子）

Posted 2023-03-14

参考技术A public interface X public double f();public class A implements X public double f() int sum = 0; for(int i = 1; i < 10; i+=2) int tmp = 1; for(int j = 1; j <= i; j++) tmp *= j; sum += tmp; return sum; public class B implements X public double f() int sum = 0; for(int i = 2; i < 11; i+=2) int tmp = 1; for(int j = 1; j <= i; j++) tmp *= j; sum += tmp; return sum; public class Main public static void main(String[] args) X a = new A(); System.out.println(a.f()); X b = new B(); System.out.println(b.f());