• Java中list多对多拆分


    两个list多对多拆分

    private Map<String,Map<String,Object>> splitAndMatch(List<PaymentOrder> list1,List<RepaymentOfflineOperationCompute> list2){

    if (list1 == null){
      list1=new ArrayList<>();
    }
    if (list2 == null){
      list2=new ArrayList<>();
    }
    //排序
    Collections.sort(list1, new Comparator<PaymentOrder>() {
      @Override
      public int compare(PaymentOrder o1, PaymentOrder o2) {
        return o1.getTransactionDate().compareTo(o2.getTransactionDate());
      }
    });
    Collections.sort(list2, new Comparator<RepaymentOfflineOperationCompute>() {
      @Override
      public int compare(RepaymentOfflineOperationCompute o1, RepaymentOfflineOperationCompute o2) {
        return o1.getCreateTime().compareTo(o2.getCreateTime());
      }
    });

    int settlementLength = list1.size();
    int paymentFlowLength = list2.size();
    Map<String,Map<String,Object>> result = new HashMap<>(paymentFlowLength);

    //字段组合
    Map<Long,BigDecimal> flowNotMatchAmountMap = list2.stream().collect(Collectors.toMap(RepaymentOfflineOperationCompute::getId,RepaymentOfflineOperationCompute::getAllAmount));

    Map<Long,BigDecimal> orderNotMatchAmountMap = list1.stream().collect(Collectors.toMap(PaymentOrder::getId,PaymentOrder::getAllAmount));

    //拆分
    for (int i = 0; i < paymentFlowLength ; i++) {
      Long internalNo = list2.get(i).getId();
      Map<String,Object> amount = result.get(internalNo);
      if (amount == null) {
        amount = new HashMap<>();
        result.put(internalNo.toString(),amount);
      }
      BigDecimal flowAvailableAmount = flowNotMatchAmountMap.get(internalNo);
      for (int j = 0; j < settlementLength; j++) {
      Long bussNo = list1.get(j).getId();
      BigDecimal orderAvailableAmount = orderNotMatchAmountMap.get(bussNo);

      if (flowAvailableAmount.equals(BigDecimal.ZERO)){
        break;
      }
      if (orderAvailableAmount.equals(BigDecimal.ZERO)){
        continue;
      }
      if (flowAvailableAmount.compareTo(orderAvailableAmount)>=0){
        amount.put(bussNo.toString(),orderAvailableAmount);
        flowAvailableAmount = flowAvailableAmount.subtract(orderAvailableAmount);
        orderAvailableAmount = orderAvailableAmount.subtract(orderAvailableAmount);
      }else{
        amount.put(bussNo.toString(),flowAvailableAmount);
        orderAvailableAmount = orderAvailableAmount.subtract(flowAvailableAmount);
        flowAvailableAmount = flowAvailableAmount.subtract(flowAvailableAmount);
      }
      flowNotMatchAmountMap.put(internalNo,flowAvailableAmount);
      orderNotMatchAmountMap.put(bussNo,orderAvailableAmount);
      }

    }
    return result;

    }




    Map<String,Integer> map1 = new HashMap<>();
    map1.put("money1",200);
    Map<String,Integer> map2 = new HashMap<>();
    map2.put("money2",200);

    List<Map<String,Integer>> list1 = new ArrayList<>();
    list1.add(map1);
    list1.add(map2);

      Map<String,Integer> map3 = new HashMap<>();
      map3.put("value1",100);
      Map<String,Integer> map4 = new HashMap<>();
      map4.put("value2",200);
      Map<String,Integer> map5 = new HashMap<>();
      map5.put("value3",100);

      List<Map<String,Integer>> list2 = new ArrayList<>();
      list2.add(map3);
      list2.add(map4);
      list2.add(map5);

      List<UserVo> resultList = new ArrayList<>();
      for(int i=0;i<list2.size();i++){
        String key2 = list2.get(i).keySet().iterator().next();
        //for(String s : list2.get(i).keySet()){
          // key2 = s;
        //}
        Integer value = 0;
        Integer value2 = list2.get(i).get(key2);
        if(value2 <= 0) {
          continue;
        }
        for (int j = 0; j < list1.size(); j++) {
          String key1 = list1.get(j).keySet().iterator().next();
          //for (String s : list1.get(j).keySet()) {
            // key1 = s;
          //}
          Integer value1 = list1.get(j).get(key1);
          if(value1 > 0 && value2 > 0) {
            if (value1 >= value2) {
              value = value2;
              value1 = value1 - value2;
              value2 = 0;
            } else {
              value = value1;
              value2 = value2 - value1;
              value1 = 0;
            }
          list1.get(j).put(key1, value1);
          list2.get(i).put(key2, value2);
          System.out.println("=======" + key2 + "=======" + value);
          UserVo user = new UserVo();
          user.setId(key2);
          user.setName(value.toString());
          user.setAreaName(key1);
          resultList.add(user);
        }
      }
    }

    System.out.println("拆分结果为:============" + JSON.toJSONString(resultList));

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  • 原文地址:https://www.cnblogs.com/smj1990/p/11738959.html
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