什么是序列化(serialization)?

问题：what is serialization?

解释：

serialization is the process of turning an object in memory into a stream of bytes so you can do stuff like store it on disk or send it over the network.put everything in serial.

Deserialization is the reverse process：turning a stream of bytes into an object in memory
那么问题来了，为什么必须把object转换为字节流呢?
对象在内存中的数据分布有可能是零散的(链表形式？)，序列化需要把相关的数据依次排列起来，方便处理，如果直接存储，会导致references to things that don't exist outside of the JVM。
参考链接：1.https://stackoverflow.com/questions/633402/what-is-serialization
2.https://www.quora.com/To-do-serialization-in-Java-why-should-we-convert-a-Java-object-into-bytes-Isnt-everything-in-a-computer-stored-in-bits-bytes-only