java合并时间段去重

Posted 2022-01-14 gsls200808

合并时间段去重

先做排序，后判断时间交叉，合并时间段去重

代码如下

/**
     * 合并去重时间段
     *
     * @return
     */
    public static List<Map<String, Date>> getTimePeriodListDumplictcatePeriod(List<Map<String, Date>> periodList) 
        List<Map<String, Date>> result = new ArrayList<>();
        //列表不能为空
        if (periodList == null) 
            return null;
        
        //对数据排序，开始时间从小到大
        Collections.sort(periodList, new Comparator<Map<String, Date>>() 
            @Override
            public int compare(Map<String, Date> u1, Map<String, Date> u2) 
                long diff = u1.get("startDate").getTime() - u2.get("startDate").getTime();
                if (diff > 0) 
                    return 1;
                 else if (diff < 0) 
                    return -1;
                
                return 0; //相等为0
            

        );

        for (int i = 0; i < periodList.size() - 1; i++) 
            int j = i + 1;
            //判断 i的Endtime 与j 的Begintime 是否有交叉，有交叉，更新 j的Begintime 为i的Begintime, 并移除i
            if (periodList.get(i).get("endDate").after(periodList.get(i).get("startDate"))) 
                periodList.get(j).put("startDate", periodList.get(i).get("startDate"));
                periodList.remove(i);
                i--;
            
        

        result = periodList;
        return result;