BiFunction函数式接口

public class Main {


    public static void main(String[] args) throws Exception {


        /**
         * 类似变量声明式定义函数式接口
         * 左边是该函数式接口的具体实例，右边是具体行为
         */
        //BiFunction<Integer,Integer,Integer> bf = (a,b)->a+b;
        
        System.out.println(operator(10,21,(a,b)->a+b));
        System.out.println(operator(10,2,(a,b)->a-b));
        System.out.println(operator(8,4,(a,b)->a*b));
        System.out.println(operator(10,2,(a,b)->a/b));


    }
    
    public static Integer operator(Integer a, Integer b, BiFunction<Integer,Integer,Integer> bf){
        return bf.apply(a,b);
    }


}