技術標籤：java基礎java

public static List<AgentCreditTankResponse> fun2(List<AgentCreditTankResponse> stus) {
    List<Map.Entry<BigDecimal, List<AgentCreditTankResponse>>> list = stus.stream().collect(Collectors.groupingBy(AgentCreditTankResponse::getVal)).entrySet()
            .stream().sorted((s1, s2) -> -s1.getKey().compareTo(s2.getKey())).collect(Collectors.toList());
    int rank = 1;//設定排名
    int index = 1;//設定排序號
    List<AgentCreditTankResponse> finlist=new ArrayList<AgentCreditTankResponse>();
    for (Map.Entry<BigDecimal, List<AgentCreditTankResponse>> entry : list) {
        for (AgentCreditTankResponse competitionWorkExhibitionPo1 : entry.getValue()) {
            if(entry.getValue().size()>1){
                competitionWorkExhibitionPo1.setRankNumber(rank);
            }else{
                competitionWorkExhibitionPo1.setRankNumber(index);
                rank++;
            }
            index++;
            finlist.add(competitionWorkExhibitionPo1);
        }
    }
    finlist.stream().forEach(System.out::println);
    return finlist;
}