Java Object Serialization Specification: 2 - Object Output Classes - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

Java Object Serialization Specification

2.6 The useProtocolVersion Method

Due to a stream protocol change that was not backwards compatible, a mechanism has been added to enable the current Virtual Machine to write a serialization stream that is readable by a previous release. Of course, the problems that are corrected by the new stream format will exist when using the backwards compatible protocol.
Stream protocol versions are discussed in Section 6.3, "Stream Protocol Versions."

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