Java 反序列化后未保留我的全局变量值

我序列化了一个名为GreenhouseControls的类，如下所示：

public class GreenhouseControls extends Controller implements Serializable{

 ......

    public void saveState() {
          try{
              // Serialize data object to a file
              ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("dump.out"));
              out.writeObject(GreenhouseControls.this);
              System.out.println(GreenhouseControls.errorcode); // Prints 1
              out.close();
              } catch (IOException e) {
              }
      }

 ......

}

public class GreenhouseControls extends Controller implements Serializable{

......

    public class Restore extends Event {

          .....

          @Override
          public void action()  { 
              try {

                  FileInputStream fis = new FileInputStream(eventsFile); 
                  ObjectInputStream ois = new ObjectInputStream(fis);  
                  GreenhouseControls gc = (GreenhouseControls) ois.readObject(); 
                  System.out.println("Saved errorcode: " + gc.errorcode); // Prints 0 (the default value)
                  ois.close();        
              }catch (IOException | ClassNotFoundException e) {
                  e.printStackTrace();
              } 
          }
      }

......

}

序列化GreenhouseControls对象时，全局静态变量“errorcode”设置为1

然后我反序列化了GreenhouseControls类，如下所示：

public class GreenhouseControls extends Controller implements Serializable{

 ......

    public void saveState() {
          try{
              // Serialize data object to a file
              ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream("dump.out"));
              out.writeObject(GreenhouseControls.this);
              System.out.println(GreenhouseControls.errorcode); // Prints 1
              out.close();
              } catch (IOException e) {
              }
      }

 ......

}

public class GreenhouseControls extends Controller implements Serializable{

......

    public class Restore extends Event {

          .....

          @Override
          public void action()  { 
              try {

                  FileInputStream fis = new FileInputStream(eventsFile); 
                  ObjectInputStream ois = new ObjectInputStream(fis);  
                  GreenhouseControls gc = (GreenhouseControls) ois.readObject(); 
                  System.out.println("Saved errorcode: " + gc.errorcode); // Prints 0 (the default value)
                  ois.close();        
              }catch (IOException | ClassNotFoundException e) {
                  e.printStackTrace();
              } 
          }
      }

......

}

---

当我在反序列化后将“errorcode”打印到console时，我期望值为1，但打印的却是0，变量的默认值。反序列化后是否应保留静态变量序列化时的值

否，静态变量不会序列化，因为它们独立于要序列化的实例化对象而存在。

要展开，将序列化非瞬态和非静态的变量。序列化的目的是能够从流中恢复对象的状态。由于静态变量不是此类的状态，而是系统的状态，所以它不是序列化的

注意，通过实现和方法序列化静态是可能的，但可能不是明智的

---

描述这一点的详细程度超出了您可能关心的范围；-）

请参见，以便能够恢复对象的状态。