Question

我正在使用OWL-S API（源代码和javadoc：http://on.cs.unibas.ch/owls-api/apidocs/）

如果我这样做，我会得到正确的结果：

public class Example {
    private static ISWRLFactory factory; //is a interface
    private string url = "http://...";
    private Service aService;
    private OWLOntology ont;

    void method_A(){
            URI aURI = URI.create(url);
            OWLKnowledgeBase aKB = OWLFactory.createKB();    
            aService = aKB.readService(aURI);
            ont = aKB.createOntology(aURI);
            ont.createService(aService.getURI());

    }

    void method_B(){
    factory = SWRLFactory.createFactory(ont);
    Atom builtAtom = factory.createNotEqual(x, variab); //x and variab are two variable
    }
   }

但如果我这样做，我就没有正确的结果：

public class Example {
    private static ISWRLFactory factory; //is a interface
    private string url = "http://...";
    private Service aService;
    private OWLOntology ont;


    void method_A(){
            URI aURI = URI.create(url);
            OWLKnowledgeBase aKB = OWLFactory.createKB();    
            aService = aKB.readService(aURI);
            ont = aKB.createOntology(aURI);
            ont.createService(aService.getURI());
            factory = SWRLFactory.createFactory(ont);
    }

    void method_B(){
    Atom builtAtom = factory.createNotEqual(x, variab); //x and variab are two variable
    }
}

为什么？

Answer 1

执行“factory = SWRLFactory.createFactory（ont）;”时存在差异method_A（）和method_B（）中的行。你确定在method_A（）和method_B（）调用之间没有修改'factory'对象吗？ 'x'和'variable'是否依赖于'factory'？

Java参考不正确

1 个答案: