Java 排名方法

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// 获取排行榜
public static Map<Double, Integer> getRankContainer(List<BigDecimal> list) {
    Map<Double, Integer> rankContainer = new HashMap<>();

    list.sort(Comparator.reverseOrder());

    int rank = 0, repeatCount = 0;
    BigDecimal prev = BigDecimal.valueOf(Long.MIN_VALUE);
    for (BigDecimal currVal : list) {
        if (currVal.compareTo(prev) == 0) {// 与上个值相等，重复次数+1
            repeatCount++;
        } else {// 与上个值不等，重复次数归0
            prev = currVal;
            rank = rank + repeatCount + 1;
            repeatCount = 0;
        }
        rankContainer.put(currVal.doubleValue(), rank);
    }

    return rankContainer;
}