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标题: java常见错误问题 [打印本页]

作者: java 时间: 2017-11-17 09:31
标题: java常见错误问题
１.对于获取对象后，要先进行判空操作，再进行对其内部的引用操作，防止出现异常
AdBudget orgAdBudget = adBudgetDao.getById(adModel.getAdBudget().getId());
        if (orgAdBudget == null){
            logger.error("getAd AdBudgetId: {}  Business logic error, AdBudgetId shouldn't be empty!", adModel.getAdBudget().getId());
            return null;
         }
if (orgAdBudget.getBudget() != adModel.getAdBudget().getBudget())
............

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