最病 A Incompatible changes a Changing a class from serializable to externalizable or vice versa a Changing a class from a non-enum type to an enum type or vice versa a Removing either serializable or externalizable a Adding the writeReplace or read Resol ve method to a class is incompatible if the behavior would produce an object that is incompatible with any older version of the cass。 Institute of Computer Software 2021/1/28 Nanjing UniversityIncompatible changes  Changing a class from Serializable to Externalizable or vice versa  Changing a class from a non-enum type to an enum type or vice versa  Removing either Serializable or Externalizable  Adding the writeReplace or readResolve method to a class is incompatible if the behavior would produce an object that is incompatible with any older version of the class. 2021/1/28 Institute of Computer Software Nanjing University 36