Source code for sdk

I have a simple question ( I think so ...). I'm getting start with java and I've this problem: I unzipped file src in jdk1.3.1_07. I'd like reading the source code of some classes. But in many classes I found only the declaration of the methods and not the body. For example, in file "System.java" ( in the package java.lang) there is only:
public static native void arraycopy(Object src, int src_position,
Object dst, int dst_position,
int length);
So, where can I found the body?
Thank you

The method is a native method; this means that it's written in code other than java (probably assembly or c++). I doubt that Sun will ever give you the code source to it, no matter how nice you ask...

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