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Snailclimb merged 1 commit into from
Sep 5, 2019
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修改错别字，去掉多余空格 #462

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5 changes: 2 additions & 3 deletions docs/java/Java疑难点.md
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Expand Up @@ -67,7 +67,7 @@ Reference:[Java中equals方法造成空指针异常的原因及解决方案](htt

## 1.2. 整形包装类值的比较

所有整形包装类对象值得比较必须使用equals方法。
所有整形包装类对象值的比较必须使用equals方法。

先看下面这个例子：

Expand Down Expand Up @@ -150,8 +150,7 @@ Reference:《阿里巴巴Java开发手册》

比如我们如果自定义了一个Student类,其中有一个属性是成绩score,如果用Integer而不用int定义,一次考试,学生可能没考,值是null,也可能考了,但考了0分,值是0,这两个表达的状态明显不一样.

**说明** :POJO 类属性没有初值是提醒使用者在需要使用时，必须自己显式地进行赋值，任何 NPE 问题，或
者入库检查，都由使用者来保证。
**说明** :POJO 类属性没有初值是提醒使用者在需要使用时，必须自己显式地进行赋值，任何 NPE 问题，或者入库检查，都由使用者来保证。

**正例** : 数据库的查询结果可能是 null，因为自动拆箱，用基本数据类型接收有 NPE 风险。

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