java - 持久化 Java Bean

Question

我是 Java Beans 的新手。我已经读过，为了使 Java Bean 持久化，它们的类必须扩展 Serializable 类。他们坚持到什么时候？直到JVM重新启动？

Answer 1

It depends where you have persisted the data.

If you have persisted data into a file then it will remain till you delete the file explicitly. This file could be used to reconstruct the object whenever required.

If you persist data over a wire and reconstruct the object again then it will remain depending on its scope (Garbage collection) and will definitely be removed once JVM is killed.

Answer 2

持久性意味着将它们保存到数据库中。我们在 java 中有许多 ORM（对象关系映射）库，如 Hibernate、Data Nucleus 等。您可以使用 ORM 库将 Java bean 对象持久保存到数据库中，当您再次从数据库中获取时，您可以获得 Java Bean 对象的集合。