a question about directory structure of libjava

Thu Jan 20 08:50:00 GMT 2011

Hi.
I'm new to gcj. And I'm reading the source code in the directory of
libjava. I'm a little confused by the structure of the directory.
I found that there often exists two java files, which have much
differnce in content, having the same name in different directories.
Such as,
libjava/java/lang/Class.java
libjava/classpath/java/lang/Class.java
Will both of them be used?
I also found C++ files libjava/java/lang/Class.h, which declares the
class Class in C++ corresponding to Class.java.
And libjava/java/lang/natClass.cc, which implements the native methods.
 But there's often no implementation of methods in C++.
 Dose the method code come from the Java file? How dose this happen?
Thank you.
Gmmajia