java反射:getMethods函数没有显示方法

Question

import java.lang.reflect.Method;
import java.util.Arrays;

public class Test
{
     public static void main(String s[]) throws ClassNotFoundException
     {
        Class cls = Class.forName("Test");
        System.out.println("Class is "+cls);
        Method[] mtds = cls.getMethods();
        System.out.println("Methods are "+Arrays.deepToString(mtds));  // not having all methods
    }

    void reflectionTestMethod()
    {
        System.out.println("test");
    }
}

输出是

类是Test

方法是[public static void Test.main(java.lang.String [])throws java.lang.ClassNotFoundException,public final void java.lang.Object.wait()throws java.lang.InterruptedException,public final native void java. lang.Object.wait(long)抛出java.lang.InterruptedException,public final void java.lang.Object.wait(long,int)throws java.lang.InterruptedException,public boolean java.lang.Object.equals(java.lang .Object),public java.lang.String java.lang.Object.toString(),public native int java.lang.Object.hashCode(),public final native java.lang.Class java.lang.Object.getClass() ,public final native void java.lang.Object.notify(),public final native void java.lang.Object.notifyAll()]

为什么reflectionTestMethod()在输出中不可用？

Answer 1

getMethods() 返回公共方法(因为它在Javadoc中声明)

尝试getDeclaredMethods()改为或将方法公之于众.

顺便说一下,你可以这样做:

Class cls = Test.class;
System.out.println("Class is " + cls);
for(Method method : cls.getDeclaredMethods())
    System.out.println(method);