Java开发网 - 我想问问关于序列化，多谢大家

Topic: 我想问问关于序列化，多谢大家

1.我想问问关于序列化，多谢大家

Posted by: magician
Posted on: 2003-08-15 14:34

如果我没有使用任何需要序列化的操作

而对象本身实现了序列化的接口

那么在普通方法的调用、参数传递过程中，性能会受到影响吗？

比如Order这个类implement Serializable

现在有两个方法：

Order getOrder(int orderID)
void createOrder(Order order)

在调用这两个方法的时候，order实现序列化，和没有实现序列化，性能上有什么不同吗？

多谢各位解答了！

2.Re:我想问问关于序列化，多谢大家 [Re: magician]	Copy to clipboard
Posted by: menzy Posted on: 2003-08-15 14:44 看一下java 规范，除了该类的存储空间会有所损失以外，不会影响普通操作

3.Re:我想问问关于序列化，多谢大家 [Re: magician]	Copy to clipboard
Posted by: magician Posted on: 2003-08-15 14:47 是指内存的存储空间？如果是，那么调用过程应该会受影响啊？我查过API，规范还没看.............

4.Re:我想问问关于序列化，多谢大家 [Re: magician]	Copy to clipboard
Posted by: jameszhang Posted on: 2003-08-15 17:12 会有不同，这正是ejb2.0中出现LOCAL 和REMOTE两种接口的原因之一，不知我的理解对否？

5.Re:我想问问关于序列化，多谢大家 [Re: magician]	Copy to clipboard
Posted by: lixj0571 Posted on: 2003-08-20 17:34 这正是ejb2.0中出现LOCAL 和REMOTE两种接口的原因之一，不知我的理解对否？这是为在session Bean 调用entity bean .再有是在一个jvm

6.Re:我想问问关于序列化，多谢大家 [Re: magician]	Copy to clipboard
Posted by: zyzhang Posted on: 2003-08-20 20:57 This can make difference when you do remote method calls or store/restore Order Object from file. This is why serialiazable interface(it's just a tag) is introduced.

7.Re:我想问问关于序列化，多谢大家 [Re: magician]	Copy to clipboard
Posted by: hut Posted on: 2003-09-08 18:30 在同一个JVM中没有多大区别，但是在不同的JVM中，参数传递是按值传递的

8.Re:我想问问关于序列化，多谢大家 [Re: magician]

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Posted by: ftang
Posted on: 2003-09-08 21:56

"hut" is right, nothing about REMOTE and LOCAL, just because in one JVM, object pass by reference, but in different JVM, pass by Value. one thing I notice is: some app server, the web container and ejb container is two JVM, so watch out...

"menzy" said check the java api, I read this from jdk1.2 spec, that was long long time ago, but I still think u can find this, in J2SE spec not j2EE.

Local interface is used by in one JVM. but currently all the Enterprise enviroment who will only have one JVM? I called IBM, they don't suggest ONLY use LOCAL Call, too dangerous, if the ejb container is failed, u should try to talk any ejb container in ur enviroment

9.Re:我想问问关于序列化，多谢大家 [Re: ftang]

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Posted by: jameszhang
Posted on: 2003-09-09 09:12

ftang wrote:
"hut" is right, nothing about REMOTE and LOCAL, just because in one JVM, object pass by reference, but in different JVM, pass by Value. one thing I notice is: some app server, the web container and ejb container is two JVM, so watch out...

"menzy" said check the java api, I read this from jdk1.2 spec, that was long long time ago, but I still think u can find this, in J2SE spec not j2EE.

Local interface is used by in one JVM. but currently all the Enterprise enviroment who will only have one JVM? I called IBM, they don't suggest ONLY use LOCAL Call, too dangerous, if the ejb container is failed, u should try to talk any ejb container in ur enviroment

您的意思是在一个JVM中用REMOTE and LOCAL的性能是一样的吗？
您的“ONLY use LOCAL Call” 好象在一个项目中不太可能，如果不考虑扩展我认为可以不用EJB