Java反射，getMethod（） [英] Java Reflection, getMethod()

问题描述

我正在使用Java反射的基础知识，并观察类的方法的信息。我需要得到一个匹配getMethod（）函数所描述的规范的方法。但是，当我这样做，我得到一个NoSuchMethodException，我希望你能告诉我为什么我的实现是不正确的。

I'm working with the basics of Java reflection and observing information on methods of classes. I need to get a method that matches specifications as described by the getMethod() function. However, when I do this I get a NoSuchMethodException, and I was hoping you could tell me why my implementation is incorrect.

static void methodInfo2(String className) throws ClassNotFoundException, 

NoSuchMethodException{

        Class cls = null;
        try{
            cls = Class.forName(className);
        } catch(ClassNotFoundException e){
            e.printStackTrace();
        }
        System.out.println("Cls:  "+cls);


        Method method1 = cls.getMethod("test", null);
        System.out.println("method1:  "+method1);


    }

EDIT1：当我打印出Cls ：+ cls，输出为Cls：class a8.myclass2。为什么它附加类部分？ （a8是正确的，所以不要担心）/ EDIT1

When I print out "Cls: "+cls, the output is "Cls: class a8.myclass2". Why does it append the class part? (the a8 is correct, so don't worry about that) /EDIT1

这是我用来从我的主要函数读入类的函数，然后我想要getMethod（）与参数test和null，其中test是方法的名称，null表示该方法没有参数。我正在读的类叫做myclass2，它在这里：

This is the function I use to read in a class from my main function, and then I want to getMethod() with the parameters "test" and null, where "test" is the name of the method and null means the method has no parameters. The class I am reading in is called myclass2 which is here:

package a8;

public class myclass2 {

    void test(){
        //"takes no parameters"
        //"returns bool"
        //"name starts with test"
        //return true;
    }

}

确实存在于类中。如果你能指出我的错误，我会真的很感激。

As you can see, the method does infact exist in the class. If you could point out my mistake, I would really appreciate it.

推荐答案

将您的测试方法设为公开。我相信Class.getMethod（）只限于公共方法。

Make your test method public. I believe Class.getMethod() is limited to public methods.

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