Although the serializable interface in Java has no methods and no fields, it can realize its functions What about?

Although Java io. Serializable interface public interface serializable {} surprisingly does not contain any methods and fields in Java, but the class implementing this interface can realize the functions of serialization and deserialization (the state of the object is serialized or deserialized) How to implement serialization and deserialization without any method or domain in Java?

Solution

Some interfaces are used only as "tags" or "flags"

UIDs and custom readers / writers are accessed through reflection

Serializable is a tag that JRE / JVM can take action based on its existence

http://en.wikipedia.org/wiki/Marker_interface_pattern