how to use a SWIG generated C++ class in a java program

I am successfully building a shared library that is C++ and loading it in my Java program with System.loadLibrary()

My class in the C++ file was called Classifier

How do I instantiate a new "Classifier" object in java? Do I have to compile and include the java files that are generated from Swig to do such a thing? If I do not want to do that, can I just use the methods from the class? 开发者_如何学运维

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Used correctly, SWIG will have generated a wrapper Java class called "Classifier."

Yes, this needs to be compiled -- e.g., by including it in your IDE project and/or your build.

The SWIG documentation for Java shows how to instantiate a C++ object from Java:

C++ classes are wrapped by Java classes as well. For example, if you have this class,

class List {
public:
  List();
  ~List();
  void insert(char *item);
  ...

you can use it in Java like this:

List l = new List();
l.insert("Ale");
...

A few other thoughts:

• You can ask SWIG to place the Java class in a package of your choosing, with the -package option on the SWIG command line.
• I personally keep generated code in a separate source tree. You'll be periodically deleting it, and don't want to accidentally delete non-generated code.
• If you do not need access to any C++ classes in your Java code, you might find JNA easier to work with than SWIG.