Readobject and writeobject methods of Java serializable serialization Interface

Previously, I was not very familiar with readobject () and writeobject (). I don't understand why the two are private. There are manyArticleThey all talk about how to use them, but they do not clarify the truth clearly.

This article well answered this question: http://www.javablogging.com/what-are-writeobject-and-readobject-customizing-the-serialization-process/

Here is the English translation of the article: http://bluepopopo.iteye.com/blog/486548

In short, readobject () and writeobject () do not exist in Java. Lang. object or are declared in serializable. So how does objectoutputstream use them? Originally, objectoutputstream usedReflectionTo check whether the two methods are declared. Because objectoutputstream uses getprivatemethod, these methods have to be declared as private for objectoutputstream to use.