反序列化后获取静态值

Question

请澄清我为什么在反序列化后获得公司价值。我知道“静态是隐含的瞬态，所以我们不需要这样声明它们。”

    class Employee implements Serializable {
        String name;
        static String company = "My Company";

        public Employee(String name) {
            this.name = name;
        }
    }

    public class Test8 {
        public static void main(String[] args) throws Exception {
            Employee e = new Employee("John");
            serializeObject(e);// assume serialize works fine
            Employee e1 = deserializeObject(); // assume deserialize works fine
            System.out.println(e1.name + " " + e1.company);
        }

   public static void serializeObject(Employee e) throws IOException {
        FileOutputStream fos = new FileOutputStream("Test8.cert");
        ObjectOutputStream oos = new ObjectOutputStream(fos);
        oos.writeObject(e);
        oos.flush();
        oos.close();
    }

    public static Employee deserializeObject() throws IOException, ClassNotFoundException {
        FileInputStream fis = new FileInputStream("Test8.cert");
        ObjectInputStream oos = new ObjectInputStream(fis);
        return (Employee) oos.readObject();
    }


    }

Answer 1

静态字段company 的值是在您第一次使用Employee 类时设置的。在您的情况下，它将符合要求：

Employee e = new Employee("John");

这个值没有改变，因为它没有被序列化和反序列化，所以它保持不变，这意味着

System.out.println(e1.name + " " + e1.company);

打印John My Company。

---

但即使你删除线

Employee e = new Employee("John");
serializeObject(e);

从您的代码中，并且只调用

public static void main(String[] args) throws Exception {
    Employee e1 = deserializeObject(); // assume deserialize works fine
    System.out.println(e1.name + " " + e1.company);
}

Employee 类仍将在 deserializeObject 中加载（通过oos.readObject() 方法），因此其静态字段也将正确初始化为其默认值。