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Optional 详解 | Andrewei #2

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andrewei1316 opened this issue Oct 11, 2020 · 0 comments
Open

Optional 详解 | Andrewei #2

andrewei1316 opened this issue Oct 11, 2020 · 0 comments
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https://andrewei1316.github.io/2019/05/18/java-optional/

定义 Optional 的出现主要为了解决 NullPointerExcepton 的异常。 Optional 是一个值的容器，用来存储一个 Object 或者 null。 它是一个基于值的类(value-base class)。 基于值的类(value-base class) 需要满足以下几个条件: 必须为 final 和 不可变的(可以包含可变对象的引用)； 必须实现 equals、
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