java - 在java中，我应该重写多少readObject() writeObject()？

Question

这似乎是一个奇怪的问题，但看看这个简单的代码:

public class Father implements Serializable{
    private static final long serialVersionUID = 1L;
    String familyName = "Josepnic";
    String name = "Gabriel"
    void writeObject (ObjectOutputStream out) throws IOException{
        out.writeObject(familyName);
        out.writeObject(name);
    }
    void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
        familyName = (String) in.readObject();
        name = (String) in.readObject();
    }
}
public class Child extends Father{
    private static final long serialVersionUID = 1L;
    String name = "Josep";
    void writeObject (ObjectOutputStream out) throws IOException{
        out.writeObject(name);
    }
    void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
        name = (String) in.readObject();
    }
}

不知道Child是否也应该写他父亲的姓氏，还是会自动写？ (我这么说是因为父亲有一个writeObject()，它本身有一个，但我不知道Java序列化的处理方式)。

也许一个好的建议是

public class Child extends Father{
    private static final long serialVersionUID = 1L;
    String name = "Josep";
    @Override
    void writeObject (ObjectOutputStream out) throws IOException{
        super.writeObject(out);
        out.writeObject(name);
    }
    @Override
    void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
        super.readObject(in);
        name = (String) in.readObject();
    }
}

Answer 1

void writeObject (ObjectOutputStream out) throws IOException{
    out.writeObject(familyName);
    out.writeObject(name);
}
void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
    familyName = (String) in.readObject();
    name = (String) in.readObject();
}

void writeObject (ObjectOutputStream out) throws IOException{
    out.writeObject(name);
}
void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
    name = (String) in.readObject();
}

您在发布的这些方法中放入什么内容根本不重要，因为它们都没有被调用。根据对象序列化规范的要求，它们不是私有(private)，因此序列化不会调用它们。

鉴于它们应该是私有(private)的，使用 @Override 也是徒劳的。

由于您的代码可能有效，因此您可以仅凭这一点得出结论:您根本不需要这样做。让序列化为您做这件事。