List中的对象属性 求和、最大值、最小值、平均值（ int、long、double、BigDecimal）

public class ListCalculate {
    public static void main(String[] args) {
        List<Money> moneyList = getMoneyList();
        // List中的对象属性 求和
        int sumInt = ().mapToInt(Money::getAmountInt).sum();
        long sumLong = ().mapToLong(Money::getAmountLong).sum();
        double sumDouble = ().mapToDouble(Money::getAmountDouble).sum();
        BigDecimal sumBigDecimal = ().map(Money::getAmountBigDecimal).reduce(, BigDecimal::add);

        // List中的对象属性 求最大值
        int maxInt = ().mapToInt(Money::getAmountInt).max().getAsInt();
        long maxLong = ().mapToLong(Money::getAmountLong).max().getAsLong();
        double maxDouble = ().mapToDouble(Money::getAmountDouble).max().getAsDouble();
        BigDecimal maxBigDecimal = ().map(Money::getAmountBigDecimal).reduce(, BigDecimal::max);

        // List中的对象属性 求最小值  注意BigDecimal
        int minInt = ().mapToInt(Money::getAmountInt).min().getAsInt();
        long minLong = ().mapToLong(Money::getAmountLong).min().getAsLong();
        double minDouble = ().mapToDouble(Money::getAmountDouble).min().getAsDouble();
        BigDecimal minBigDecimal = ().map(Money::getAmountBigDecimal).reduce(, BigDecimal::min); // 0
        BigDecimal minBigDecimal2 = ().map(Money::getAmountBigDecimal).min(BigDecimal::compareTo).get(); // 143
        ;

        // List中的对象属性 求平均值
        double averageInt = ().mapToInt(Money::getAmountInt).average().getAsDouble();
        double averageLong = ().mapToLong(Money::getAmountLong).average().getAsDouble();
        double averageDouble = ().mapToDouble(Money::getAmountDouble).average().getAsDouble();
        BigDecimal averageBigDecimal = ().map(Money::getAmountBigDecimal).reduce(, BigDecimal::add).divide((()), 2, RoundingMode.HALF_UP);

    }

    private static List<Money> getMoneyList() {
        List<Money> moneyList = new ArrayList<>();
        (new Money(111, 958L, 333.5, new BigDecimal(689)));
        (new Money(723, 256L, 999.0, new BigDecimal(333)));
        (new Money(135, 780L, 843.8, new BigDecimal(276)));
        (new Money(564, 671L, 745.1, new BigDecimal(143)));
        return moneyList;
    }
}

@Data
@AllArgsConstructor
class Money {
    private int amountInt;
    private long amountLong;
    private double amountDouble;
    private BigDecimal amountBigDecimal;
}