java - 反序列化后我的全局变量值没有被保留

Question

我像这样序列化了一个名为 GreenhouseControls 的类:

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) {
              }
      }

 ......

}

当 GreenhouseControls 对象被序列化时，全局静态变量“errorcode”被设置为 1。

然后我反序列化了 GreenhouseControls 类，如下所示:

public class GreenhouseControls extends Controller implements Serializable{

......

    public 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“错误代码”打印到控制台时，我期待的是 1 值，但打印的是 0(变量的默认值)。静态变量序列化时的值在反序列化后是否应该保留？

Answer 1

不，静态变量不会被序列化，因为它们独立于您要序列化的实例化对象而存在。