Mad reflection

reflection.java

import java.lang.invoke.MethodHandles;
import java.lang.reflect.Constructor;
import java.lang.reflect.Method;

class A {
    public void foo() {
        System.out.println(1);
    }
}

class B extends A {
    public void foo() {
        System.out.println(2);
    }
}

class Main {
    public static void main(String[] args) throws Throwable {
        Constructor<MethodHandles.Lookup> constructor = MethodHandles.Lookup.class.getDeclaredConstructor(Class.class);
        constructor.setAccessible(true);

        Method method = A.class.getDeclaredMethod("foo");
        A instance = new B();

        method.invoke(instance); // prints 2

        constructor.newInstance(A.class)
                .in(A.class)
                .unreflectSpecial(method, A.class)
                .bindTo(instance)
                .invoke(); // prints 1
    }
}