Java ConcurrentModificationException万能解决方案

落日映苍穹つ 2022-06-13 09:57 157阅读 0赞

#### 在遍历集合的时候,满足条件的话,需要删除当前元素和相关元素,就容易出现这种错误 ####

for (ChangeResultIncome oldRi : newResultIncome) {
                if (oldRi.getLineStatus().equals(AITypeEnum.OFFSET.getCode())) {
                    inner:for (ChangeResultIncome newRi : newResultIncome) {
                        if(oldRi.exactMatchCC(newRi)
                                && oldRi.getBeginDate().compareTo(newRi.getBeginDate())==0
                                && oldRi.getEndDate().compareTo(newRi.getEndDate())==0
                                && oldRi.getAmount() == 0-newRi.getAmount()
                                && newRi.getLineStatus().equals(AITypeEnum.NEW.getCode())){
                            newResultIncome.remove(oldRi);
                            newResultIncome.remove(newRi);
                            break inner;
                        }
                    }
                }
            }

**解决方案为:将需要删除的元素存到一个集合中,最后再统一删除**

List<ChangeResultIncome> deleteList = new ArrayList<>();
            for (ChangeResultIncome oldRi : newResultIncome) {
                if (oldRi.getLineStatus().equals(AITypeEnum.OFFSET.getCode())) {
                    inner:for (ChangeResultIncome newRi : newResultIncome) {
                        if(oldRi.exactMatchCC(newRi)
                                && oldRi.getBeginDate().compareTo(newRi.getBeginDate())==0
                                && oldRi.getEndDate().compareTo(newRi.getEndDate())==0
                                && oldRi.getAmount() == 0-newRi.getAmount()
                                && newRi.getLineStatus().equals(AITypeEnum.NEW.getCode())){
                            deleteList.add(oldRi);
                            deleteList.add(newRi);
                            break inner;
                        }
                    }
                }
            }
            newResultIncome.removeAll(deleteList);