序列化 Java:哪些类需要“实现 Serializable"? [英] Serialization Java: which classes need to "implement Serializable"?

问题描述

所以我知道我最终可能会弄清楚，但我真的找不到可以回答这个看似简单的问题的主题.

so I know I could probably figure it out eventually, but I couldn't really find a topic that answers this seemingly simple question.

我正在序列化一组对象的向量，每个这样的对象都属于一个用户定义的类.我知道向量是可序列化的.我还必须使用户定义的类实现可序列化吗?而且，这些用户定义的类中的每一个都包含其他用户定义的类.那些也必须标记为实现 Serializable 吗?(等等，或者只是顶层类需要实现Serializable)?

I am serializing a vector of a set of objects, with each such object pertaining to one user-defined class. I know vectors are serializable. Do I also have to make the user-defined class implement serializable? And, each of these user-defined classes contains other user-defined classes. Do those have to be labeled as implementing Serializable as well? (and so on, or do just the top-level class need to implement Serializable)?

(忘记应该使用 arrayLists 而不是向量，我以前听说过，我正在练习，因为我听说向量适用于多线程.我找到了讨论类似内容的主题，但不完全是这个)

(Forget noting that arrayLists should be used instead of vectors, I've heard that before, I'm practicing because I hear vectors are good for multithreading. I found topics that discuss similar stuff, but not precisely this)

谢谢

推荐答案

是的，你说得对:任何被序列化的东西，包括字段(实例变量)引用的所有类，都必须实现 Serializable，或字段必须是 transient.

Yes, you are correct: Anything being serialized, including all classes referred to by fields (instance variables), must implement Serializable, or the field must be transient.

在您的情况下，用户定义的类必须实现 Serializable，并且具有类型为 Serializable 的字段.这适用于递归，因此字段的类的字段也必须是Serializable等

In your case, the user defined class must implement Serializable, and have fields whose type is Serializable. This applies recursively, so fields of the class of the fields must also be Serializable, etc.

transient 关键字告诉序列化机制为了序列化的目的而忽略该字段.

The transient keyword tells the serialization mechanism to ignore the field for the purposes of serialization.

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