Problem using model.getClass().getMethod in case of inheritance

Question

I\'m following this article on Oracle Network to implement MVC when developing desktop applications. I have a problem, though: I\'m using an abstract Directory class ex

Answer 1

package com.test;

import java.lang.reflect.Method;

public class Test {
    public static void main(String[] args) throws Exception {
    Test test = new Test();
    Child child = new Child();

    // Your approach, which doesn't work
    try {
        Method method = test.getClass().getMethod("doSomething", new Class[] { child.getClass().getSuperclass() });
        method.invoke(test, child);
        System.out.println("This works");
    } catch (NoSuchMethodException ex) {
        System.out.println("This doesn't work");
    }

    // A working approach
    for (Method method : test.getClass().getMethods()) {
        if ("doSomething".equals(method.getName())) {
        if (method.getParameterTypes()[0].isAssignableFrom(child.getClass())) {
            method.invoke(test, child);
            System.out.println("This works");
        }
        }
    }

    }

    public void doSomething(Parent parent) {

    }
}

class Parent {

}

class Child extends Parent {

}

You need add .getSuperclass() to child

Answer 2

public class Test
{
    public static void main(String[] args) throws Exception { 
        Test test = new Test();
        Child child = new Child();

        // Your approach, which doesn't work
        try {
            test.getClass().getMethod("doSomething", new Class[] { child.getClass() });

        } catch (NoSuchMethodException ex) {
            System.out.println("This doesn't work");
        }

        // A working approach
        for (Method method : test.getClass().getMethods()) {
            if ("doSomething".equals(method.getName())) {
                if (method.getParameterTypes()[0].isAssignableFrom(child.getClass())) {
                    method.invoke(test, child);
                }
            }
        }
        System.out.println("This works");

    }

    public void doSomething(Parent parent) {

    }
}

class Parent {

}

class Child extends Parent {

}