serialVersionUID的作用

Java中serialVersionUID的作用

The serialization runtime associates with each serializable class a version number, called a serialVersionUID, 
which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes 
for that object that are compatible with respect to serialization. 
If the receiver has loaded a class for the object that has a different serialVersionUID than that of the corresponding sender's class, 
then deserialization will result in an InvalidClassException. 
A serializable class can declare its own serialVersionUID explicitly by declaring a field named serialVersionUID that must be static, final, and of type long

一言以蔽之，就是为了在反序列化时验证数据发送者，防止中间有人篡改

 

参考：

https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/io/Serializable.html

https://stackoverflow.com/questions/285793/what-is-a-serialversionuid-and-why-should-i-use-it