&& 操作符使用注意——警示！！

理论都知道，运用中，会无意犯规：

(左表达式) && (右表达式) ：操作符，只有在左表达式为 true 的情况下，才会执行后面的右表达式。

错误的写法：【您能发现么】

 1         boolean flag = true;
 2         for(ConditionBO subjectCondition : subjectConditions){
 3             Integer relationTableFieldId = subjectCondition.getRelationTableFieldId();
 4             Integer relationId = publicDataUtil.getRelationIdByRelationFieldId(relationTableFieldId);
 5             Map<Integer, Boolean> dataFlagMap = relationDataFlagMapMapTemp.get(relationId);
 6             if(CollectionUtils.isEmpty(dataFlagMap)){
 7                 dataFlagMap = new HashMap<>();
 8                 relationDataFlagMapMapTemp.put(relationId, dataFlagMap);
 9             }
10 
11             List<Map<String, String>> bussDataList = relationBussDataMapListMap.get(relationId);
12             List<Map<String, String>> ruleSuccessBussDataMapList = ruleSuccessBussDataMapListMapTemp.get(relationId);
13             if(CollectionUtils.isEmpty(ruleSuccessBussDataMapList)) {
14                 ruleSuccessBussDataMapList = new ArrayList<>();
15                 ruleSuccessBussDataMapListMapTemp.put(relationId, ruleSuccessBussDataMapList);
16             }
17             flag = flag && this.judgeValues(flag, ruleSuccessBussDataMapList, dataFlagMap, bussDataList, subjectCondition); // 标记数据是否使用
18 //            if(!flag)break;
19         }

正确的写法：

 1         boolean flag = true;
 2         for(ConditionBO subjectCondition : subjectConditions){
 3             Integer relationTableFieldId = subjectCondition.getRelationTableFieldId();
 4             Integer relationId = publicDataUtil.getRelationIdByRelationFieldId(relationTableFieldId);
 5             Map<Integer, Boolean> dataFlagMap = relationDataFlagMapMapTemp.get(relationId);
 6             if(CollectionUtils.isEmpty(dataFlagMap)){
 7                 dataFlagMap = new HashMap<>();
 8                 relationDataFlagMapMapTemp.put(relationId, dataFlagMap);
 9             }
10 
11             List<Map<String, String>> bussDataList = relationBussDataMapListMap.get(relationId);
12             List<Map<String, String>> ruleSuccessBussDataMapList = ruleSuccessBussDataMapListMapTemp.get(relationId);
13             if(CollectionUtils.isEmpty(ruleSuccessBussDataMapList)) {
14                 ruleSuccessBussDataMapList = new ArrayList<>();
15                 ruleSuccessBussDataMapListMapTemp.put(relationId, ruleSuccessBussDataMapList);
16             }
17             boolean innerFlag = this.judgeValues(flag, ruleSuccessBussDataMapList, dataFlagMap, bussDataList, subjectCondition); // 标记数据是否使用
18             flag = flag && innerFlag;
19             if(!flag)break;
20         }

后续再完善！

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原文地址：https://www.cnblogs.com/bridgestone29-08/p/14537700.html

&& 操作符 使用注意——警示！！

&& 操作符使用注意——警示！！