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The org.netbeans.modules.classfile package supports direct
access to a Java Virtual Machine classfile contents. All elements and
attributes of a classfile are accessible from this package's API. This
package only supports read-only access of classfiles at this time.
The classfile library is not actually a NetBeans module, but is only
packaged as one to use NetBeans' Auto Update facility. By being
packaged as a module, other (real) NetBeans modules may list it as
a dependency and require a minimum version to be present on the system.
The classfile library does not use any NetBeans API, only Java core API.
The classfile library has only four constructors, as the only objects that
can be created by a client are ClassFile objects (one constructor takes
an InputStream of classfile bytes, another takes a filename, and variants
of these two constructors allow creation of Code objects to be suppressed).
The ClassFile object is then queried for its elements. A ClassFile and
its elements should be considered immutable, even though it may be
possible to change one of its objects (if so, it's a bug).
Examples
Here is a simple example which dumps out a classfile:
static void printClass(String classname) {
try {
System.out.println(new ClassFile(classname));
} catch (IOException e) {
System.out.println(e.toString());
e.printStackTrace();
}
}
Here is an example which prints out any synthetic methods:
static void printSyntheticMethods(InputStream in) throws IOException {
ClassFile cf = new ClassFile(in);
Iterator iter = cf.getMethods();
while (iter.hasNext()) {
Method m = (Method)iter.next();
if (m.isSynthetic())
System.out.println(m.toString());
}
}
Related Documentation
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