What is a transient variable? and what is the native keyword?

[jwbecalm]

最近在看scjp的TIP。
有这几句话：
8.A transient variable may not be serialized.
9. The transient keyword is applicable to variables only.
10. The native keyword is applicable to methods only.


请问是什么意思？感觉以前看书没见到过。

[mofeir]

翻译成中文就是。
8.transient变量可以不是序列化的。//不过一般transient变量都是序列化的。
9.transient关键字只能形容变量。//呵呵，这个容易劣迹
10.native关键字字能形容方法。//这个也是。native一般就是去调用本地方法，难道还有本地变量？不可能

[jwbecalm]

。。。。
翻译我知道，只是书上没见过，
能有点例子吗？

[wutongjoe]

A transient variable is a variable that may not be serialized. If you don't want some field to be serialized, you can mark that field transient or static.

[wutongjoe]

Native methods are used when the implementation of a particular method is present in language other than Java say C,C++.
To use the native methods in java we use the keyword native
public native method_a()
This native keyword is signal to the java compiler that the implementation of this method is in a language other than java.
Native methods are used whenwere alize that it would take up a lot of rework to write that piece of already existing code in other language to java.

[jwbecalm]

还是不大明白，自己再去查查资料。。
谢谢个位了。