JAVA Fundamentals (ii)

Serialversionuid

This link speaks very well: Http://www.mkyong.com/java-best-practices/understand-the-serialversionuid/

In general, it is to ensure class compatibility. Assuming that the object in the archive is saved as file, and then the software is updated, serialversionuid changes, and then read file, because the ID of the object in file and the ID of the updated class, it will be an error. Therefore, when the class is not compatible with the previous case, it will change the serialversionuid. If you do not set this value, default value will be different depending on the JVM value, resulting in incompatibility with other platforms.

JAVA Fundamentals (ii)