java - 将 lambda 表达式转换回内部类？

Question

我有以下 lambda 表达式:

Function<Integer, Function<Integer, Function<BinaryOperator<Integer>, Integer>>> someComputation = i1 -> i2 -> f -> f.apply(i1, i2);

Java 8 lambda 语法对我来说还是有点陌生​​，所以我尝试将它转换回内部类，但似乎我无法转换它会引发编译错误，或者我可能遗漏了一些东西。这是我的想法:

    Function<Integer, Function<Integer, Function<BinaryOperator<Integer>, Integer>>> someComputation2 = new Function<Integer, Function<Integer, Function<BinaryOperator<Integer>, Integer>>>() {
        @Override
        public Function<Integer, Function<BinaryOperator<Integer>, Integer>> apply(Integer integer) {

            Function<Integer, Function<BinaryOperator<Integer>, Integer>> f = new Function<Integer, Function<BinaryOperator<Integer>, Integer>>() {
                @Override
                public Function<BinaryOperator<Integer>, Integer> apply(Integer integer) {


                    return new Function<BinaryOperator<Integer>, Integer>() {
                        @Override
                        public Integer apply(BinaryOperator<Integer> integerBinaryOperator) {
                            return integerBinaryOperator.apply(f,""" WHAT IS IN HERE ???""");
                        }
                    };



                }
            };

            return f;
        }
    };

Answer 1

在外部匿名类实例的方法中有两个 Integer 变量。这些是应该传递给最内层方法调用的变量:

Function<Integer, Function<Integer, Function<BinaryOperator<Integer>, Integer>>> someComputation2 = new Function<Integer, Function<Integer, Function<BinaryOperator<Integer>, Integer>>>() {
    @Override
    public Function<Integer, Function<BinaryOperator<Integer>, Integer>> apply(Integer i1) {
        Function<Integer, Function<BinaryOperator<Integer>, Integer>> f = new Function<Integer, Function<BinaryOperator<Integer>, Integer>>() {
            @Override
            public Function<BinaryOperator<Integer>, Integer> apply(Integer i2) {
                return new Function<BinaryOperator<Integer>, Integer>() {
                    @Override
                    public Integer apply(BinaryOperator<Integer> integerBinaryOperator) {
                        return integerBinaryOperator.apply(i1, i2);
                    }
                };
            }
        };
        return f;
    }
};