Function<Integer, Integer> times2 = e -> e * 2;

        Function<Integer, Integer> squared = e -> e * e;

        // 先执行参数，再执行调用者
        /*
         * 1. 4 * 4 = 16 16 * 2 = 32
         */
        System.out.println("result: " + times2.compose(squared).apply(4)); // 32

        /*
         * 先执行调用者： 4 * 2 = 8 再执行then传入的function 8 * 8 = 64
         */
        System.out.println("result: " + times2.andThen(squared).apply(4)); // 64