将对象写入文件后修改Java序列化对象

Question

下面是我的示例代码：

public class Hybrid {
public static void main(String[] args) {
    Cultivate cultivate1 = new Cultivate();
    try{
        ObjectOutputStream os = new ObjectOutputStream(new FileOutputStream("myfile"));
        os.writeObject(cultivate1);
        os.close();

        System.out.println("line 1 : "+ ++cultivate1.z+" ");

        ObjectInputStream is = new ObjectInputStream(new FileInputStream("myfile"));
        Cultivate cultivate2 = (Cultivate)is.readObject();
        is.close();

        System.out.println("line 2 : "+cultivate1.y+" "+cultivate2.z);

    } catch(Exception x){
        System.out.println("exc");
    }
}
}
class Cultivate implements Serializable{
    transient int y=3;
    static int z = 6;
}

以下是输出：

line 1 : 7 
line 2 : 3 7

有人能解释为什么要耕种吗。z打印7？ 栽培1的值。z在输出流关闭后递增。那么，这种改变是如何反映在去甲化过程中的呢

Answer 1

z是一个静态字段，即它是一个类级字段，而不是一个特定于实例的字段

静态变量属于一个类，而不属于任何单个实例。序列化的概念与对象的当前状态有关。只有与类的特定实例关联的数据才会被序列化，因此在序列化过程中会忽略静态成员字段

所以在反序列化过程中，静态变量value的值将从类中加载

Answer 2

静态变量未序列化，因此在反序列化期间，静态变量值将从类中加载。（将加载当前值。）

这里是来自ObjectOutputStream的JavaDoc：

The default serialization mechanism for an object writes the class of the object, the class signature, and the values of all non-transient and non-static fields. References to other objects (except in transient or static fields) cause those objects to be written also. Multiple references to a single object are encoded using a reference sharing mechanism so that graphs of objects can be restored to the same shape as when the original was written.