最病 A The Externalizable Interface a The class of an externalizable object must do the following: a Implement the java. io Externalizable interface a Implement a write External method to save the state of the object a Implement a readExternal method to read the data written by the write External method from the stream and restore the state of the object a Have the write External and readExternal methods be solely responsible for the format, if an externally defined format is written a Have a public no-arg constructor Institute of Computer Software 2021/1/28 Nanjing UniversityThe Externalizable Interface  The class of an Externalizable object must do the following:  Implement the java.io.Externalizable interface  Implement a writeExternal method to save the state of the object  Implement a readExternal method to read the data written by the writeExternal method from the stream and restore the state of the object  Have the writeExternal and readExternal methods be solely responsible for the format, if an externally defined format is written  Have a public no-arg constructor 2021/1/28 Institute of Computer Software Nanjing University 17