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处理NullPointerException

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避免空指针,最好的方式还是做好非空校验

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#2 Created at ... [Delete] [Delete and Lock User]

有点痛苦,感觉 java 这方面不够智能

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#3 Created at ... [Delete] [Delete and Lock User]

工作中,一般一个实体类都有几十个字段


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