class-hierarchy

问题 I am making a simple Android program that runs mnemonics or math exercises for training purposes. I have a "new exercise" button that changes question and answer. I want to implement a "text to speech" mode, where the software reads the question and the answer. After they are spoken, it should calculate a new question and start again. I am using OnUtteranceCompleted to determine if the speech has ended. My problem is that I can’t access my "new exercise" button from the callback. I am using

问题 I've got a somewhat primitive framework I've been using for most of my projects, but a general design issue came to mind that I haven't been able to work out yet. For a given application, should I separate the application-specific class structure from the framework's structure, or is building on top of the framework not such a bad thing? For example, say I had a framework with a base Controller class and extended it for a given part of my application. Which arrangement makes the most sense,

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . Looking for a tool that: Produces a visually pleasing (not garish), orthogonally structured graph hierarchy Outputs high-quality PNG images (300dpi+) Visually differentiates classes, abstract classes, interfaces, and enumerated types (preferably by colour) Interactive user interface Allows pruning of packages

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . Looking for a tool that: Produces a visually pleasing (not garish), orthogonally structured graph hierarchy Outputs high-quality PNG images (300dpi+) Visually differentiates classes, abstract classes, interfaces, and enumerated types (preferably by colour) Interactive user interface Allows pruning of packages

问题 Hopefully someone can shed some light on this issue through either an example, or perhaps some suggested reading. I'm wondering what is the best design approach for modeling tables after their class hierarchy equivalencies . This can best be described through an example: abstract class Card{ private $_name = ''; private $_text = ''; } class MtgCard extends Card{ private $_manaCost = ''; private $_power = 0; private $_toughness = 0; private $_loyalty = 0; } class PokemonCard extends Card{

问题 How do you go about changing the subtype of a row in NHibernate? For example if I have a Customer entity and a subclass of TierOneCustomer, I have a case where I need to change a Customer to a TierOneCustomer but the TierOneCustomer should have the same Id (PK) as the original Customer entity. The mapping looks something like this: <class name="Customer" table="SiteCustomer" discriminator-value="C"> <id name="Id" column="Id" type="Int64"> <generator class="identity" /> </id> <discriminator

问题 I'm looking for a way to create hierarchy in form of child parent relationship between two or more instances of same class. How would one go about creating such objects from nested dictionary like in example ? Is this even possible ? Is there some other way which would be recommended to do such task? # -*- coding: utf-8 -*- from sqlalchemy.ext.declarative import declarative_base from sqlalchemy import create_engine, exists from sqlalchemy.orm import relationship, sessionmaker from sqlalchemy

问题 So i have a project I'm working on with quite a hierarchy. In the base class of this there is a function reset() that gets called throughout all the derived classes. All I'm confused about is that, since this reset in the derived class basically just resets it's private variables and then calls it's preceding (higher) class' reset() function does the reset function have to be virtual? Eg. class Base { private: int some; public: void reset(); }; class Derive : public Base { private: int some1;

问题 Consider the following immutable classes: A B extends A C extends B D extends C ... Class A has a method called process that gets a parameter of type A , and then returns a value of the type of the calling object: public class A { public final <T extends A> T process(A a) { Class clazz = getClass(); T result = createObjectOfType(clazz); return result; } } public class B extends A { } public class C extends B { } This is the (very simple) test code: public void test() { A a = new A(); B b =

问题 For example if I wanted to see what my .NET options were for something implementing IList or IDictionary. Is there a way to find that for example in the MSDN documentation? 回答1: To find it in MSDN, I usually go to Google, type something like "MSDN IList", and to get to IList Interface which has a section "Classes that Implement IList". That's true for any of the interface classes. If you find a base class such as DictionaryBase, there will be a link called Derived Classes which will take you