public static void main(String[] args) {
        Function<Integer, Integer> plus = i -> i + 1;
        Function<Integer, Integer> mult = i -> i * i;
        System.out.println("F1:" + plus.apply(1)); // 结果2
        System.out.println("F2:" + mult.compose(plus).apply(3)); // 等于mult.apply(plus.apply(2)), 结果16
        System.out.println("F3:" + mult.andThen(plus).apply(2)); // 等于plus.apply(mult.apply(2)), 结果5
    }

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