public List findApprList(Map param) {
        
        List<Map<String, Object>> _resultList = Lists.newArrayList();
        List<Map<String, Object>> _aprvList = reportMDAO.selectApprList(param);
        
        // 결재라인보기
        if ("Y".equals(param.get("isMulti")))
        {
            for (Map<String, Object> _item : _aprvList)
            {
                _item.put("no"              , 1);
                _item.put("aprv_rqst_usr"   , _item.get("usr_nm_01"));
                _item.put("aprv_line_01"    , _item.get("usr_nm_02"));
                _item.put("aprv_line_02"    , _item.get("usr_nm_03"));
                _item.put("aprv_line_03"    , _item.get("usr_nm_04"));
                _item.put("aprv_line_04"    , _item.get("usr_nm_05"));
                _item.put("aprv_line_05"    , _item.get("usr_nm_06"));
                _item.put("aprv_line_06"    , _item.get("usr_nm_07"));
                _item.put("aprv_line_07"    , _item.get("usr_nm_08"));
                _item.put("aprv_line_08"    , _item.get("usr_nm_09"));
                _item.put("aprv_line_09"    , _item.get("usr_nm_10"));
                _item.put("aprv_line_10"    , _item.get("usr_nm_11"));
                _resultList.add(_item);
                
                Map<String, Object> _item2 = Maps.newHashMap();
                _item2.putAll(_item);
                _item2.put("no"             , 2);
                _item2.put("aprv_rqst_usr"  , _item.get("aprvemp_posnm_01"));
                _item2.put("aprv_line_01"   , _item.get("aprvemp_posnm_02"));
                _item2.put("aprv_line_02"   , _item.get("aprvemp_posnm_03"));
                _item2.put("aprv_line_03"   , _item.get("aprvemp_posnm_04"));
                _item2.put("aprv_line_04"   , _item.get("aprvemp_posnm_05"));
                _item2.put("aprv_line_05"   , _item.get("aprvemp_posnm_06"));
                _item2.put("aprv_line_06"   , _item.get("aprvemp_posnm_07"));
                _item2.put("aprv_line_07"   , _item.get("aprvemp_posnm_08"));
                _item2.put("aprv_line_08"   , _item.get("aprvemp_posnm_09"));
                _item2.put("aprv_line_09"   , _item.get("aprvemp_posnm_10"));
                _item2.put("aprv_line_10"   , _item.get("aprvemp_posnm_11"));
                _resultList.add(_item2);
                
                Map<String, Object> _item3 = Maps.newHashMap();
                _item3.putAll(_item);
                _item3.put("no"             , 3);
                _item3.put("aprv_rqst_usr"  , _item.get("aprv_dt_01"));
                _item3.put("aprv_line_01"   , _item.get("aprv_dt_02"));
                _item3.put("aprv_line_02"   , _item.get("aprv_dt_03"));
                _item3.put("aprv_line_03"   , _item.get("aprv_dt_04"));
                _item3.put("aprv_line_04"   , _item.get("aprv_dt_05"));
                _item3.put("aprv_line_05"   , _item.get("aprv_dt_06"));
                _item3.put("aprv_line_06"   , _item.get("aprv_dt_07"));
                _item3.put("aprv_line_07"   , _item.get("aprv_dt_08"));
                _item3.put("aprv_line_08"   , _item.get("aprv_dt_09"));
                _item3.put("aprv_line_09"   , _item.get("aprv_dt_10"));
                _item3.put("aprv_line_10"   , _item.get("aprv_dt_11"));
                _resultList.add(_item3);
            }
            
            Collections.sort(_resultList, new Comparator<Map<String, Object>>() {
                @Override
                public int compare(Map<String, Object> obj1, Map<String, Object> obj2) {
                    return ComparisonChain.start().compare(Integer.parseInt(String.valueOf(obj1.get("rownum_"))), Integer.parseInt(String.valueOf(obj2.get("rownum_"))))
                            .compare(Integer.parseInt(String.valueOf(obj1.get("no"))), Integer.parseInt(String.valueOf(obj2.get("no")))).result();
                }
            });
        }
        else
        {
            _resultList = _aprvList;
        }
        
    	return _resultList;
    }

* 다중조건 정렬

import java.math.BigDecimal;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;

...

        Map<String, Object> resultMap = Maps.newHashMap();
        
        Map<String, Object> _rfq                = Maps.newHashMap();
        List<Map<String, Object>> _prList       = Lists.newArrayList();
        Map<String, Object> _pr                 = Maps.newHashMap();
        List<Map<String, Object>> _prLcsList    = Lists.newArrayList();
        Map<String, Object> _cntr               = Maps.newHashMap();
        List<Map<String, Object>> _prItemList   = Lists.newArrayList();
        
        String rfq_no   = (String)param.get("rfq_no");
        

        _prList = (List<Map<String, Object>>)param.get("prList");
        
        // 집행예산 금액이 큰 순서로 정렬하되 금액이 같다면 PR No.가 큰 순서로 정렬한다. 
        Collections.sort(_prList, new Comparator<Map<String, Object>>()
        {
            @Override
            public int compare(Map<String, Object> obj1, Map<String, Object> obj2)
            {
                BigDecimal _amt1 = obj1.get("ebdg_amt") == null ? BigDecimal.ZERO : new BigDecimal(obj1.get("ebdg_amt").toString());
                BigDecimal _amt2 = obj2.get("ebdg_amt") == null ? BigDecimal.ZERO : new BigDecimal(obj2.get("ebdg_amt").toString());
                
                return ComparisonChain.start().compare(_amt2, _amt1).compare(String.valueOf(obj2.get("pr_no")), String.valueOf(obj1.get("pr_no"))).result();
            }
        });
        
        System.out.println(String.format("%0" + 100 + "d", 0).replace("0", "-"));
        for (Map<String, Object> _item : _prList)
        {
            System.out.println(String.format("%10s, %10s", _item.get("ebdg_amt"), _item.get("pr_no")));
        }
        System.out.println(String.format("%0" + 100 + "d", 0).replace("0", "-"));



----------------------------------------------------------------------------------------------------
      1000, 0090090116
      1000, 0090090114
        10, 0090090113
         0, 0090090112
----------------------------------------------------------------------------------------------------

https://howtodoinjava.com/java/sort/groupby-sort-multiple-comparators/