Code

JavaFields.java has the native method declaration and four fields that the native method will access.

Main.java is used to test the implementation.

JavaFieldsImp.cpp implements the native method in C++ that will access the Java fields.

JavaFields.h is the automatically generated header file.

Output

From native code:
public int i = 1
public float f = 2.450000
static public int si = 3
private int pi = 5

After native call:
public int i = 100
public float f = 123.45
static public int si = 200
private int pi = 300

Compilation and execution

RunNT These commands build the project and execute the program under Windows NT.

RunSolaris These commands build the project and execute the program under Solaris.

RunLinux These commands build the project and execute the program under Linux.

On sirius, you'll end up with something like this in your directory:

-rw-------   1 mmead    students     615 May 17 14:42 JavaFields.class
-rw-------   1 mmead    students     399 May 17 14:20 JavaFields.h
-rw-rw-r--   1 mmead    students     307 May 17 14:18 JavaFields.java
-rw-rw-r--   1 mmead    students    1520 May 17 14:41 JavaFieldsImp.cpp
-rw-------   1 mmead    students    1013 May 17 14:42 Main.class
-rw-rw-r--   1 mmead    students     471 May 17 14:18 Main.java
-rwx------   1 mmead    students     277 May 17 14:20 RunSolaris
-rwx------   1 mmead    students    7532 May 17 14:42 libJavaFieldsImp.so