encapsulation

What is the visibility of @synthesized instance variables?

由 浪子不回头ぞ 提交于 2019-12-17 06:09:45
问题 If you have a property in your public interface like the following @interface MyClass : NSObject @property(strong) NSString *myProp; @end And then synthesize it, in effect synthesizing the variable: @implementation MyClass @synthesize myProp = _myProp; // or just leave it at the default name.. @end What is the visibility of the instance variable _myProp ? That is, is this considered @public , @protected or @private ? I'm guessing since MySubClass could inherit from MyClass then it would also

How abstraction and encapsulation differ?

由 ↘锁芯ラ 提交于 2019-12-17 03:48:11
问题 I am preparing for an interview and decided to brush up my OOP concepts. There are hundreds of articles available, but it seems each describes them differently. Some says Abstraction is "the process of identifying common patterns that have systematic variations; an abstraction represents the common pattern and provides a means for specifying which variation to use" (Richard Gabriel). and is achieved through abstract classes. Some other says Abstraction means to show only the necessary details

Changing public data to private data in Java

由 岁酱吖の 提交于 2019-12-14 03:13:27
问题 I want to change the default constructor (person1) from public to private and then ask the user to input the information instead of the given values. I have two different classes - Person; which is encapsulated and then PersonTest which tests the information. class Person { // Data Members private String name; // The name of this person private int age; // The age of this person private char gender; // The gender of this person // Default constructor public Person() { name = "Not Given"; age

Encapsulation with React child components

由 我是研究僧i 提交于 2019-12-13 19:27:23
问题 How should one access state (just state, not the React State) of child components in React? I've built a small React UI. In it, at one point, I have a Component displaying a list of selected options and a button to allow them to be edited. Clicking the button opens a Modal with a bunch of checkboxes in, one for each option. The Modal is it's own React component. The top level component showing the selected options and the button to edit them owns the state, the Modal renders with props

In EF Code First is it possible to encapsulate properties that should be persisted to the data store?

由 余生长醉 提交于 2019-12-13 17:25:11
问题 So let's say I've got a POCO that I want EF Code First to persist to a data store: public class Campaign { public string Name { get; set; } public double GoalAmount { get; set; } private double AmountRaised { get; set; } public bool GoalMet { get { return AmountRaised >= GoalAmount; } } } Now, for whatever reason, I don't want the AmountRaised property to be accessible outside the object, but I do want it persisted to the data store. Is this possible with EF Code First? 回答1: You can make it

Abstracting away from data structure implementation details in Clojure

由 谁说我不能喝 提交于 2019-12-13 11:40:07
问题 I am developing a complex data structure in Clojure with multiple sub-structures. I know that I will want to extend this structure over time, and may at times want to change the internal structure without breaking different users of the data structure (for example I may want to change a vector into a hashmap, add some kind of indexing structure for performance reasons, or incorporate a Java type) My current thinking is: Define a protocol for the overall structure with various accessor methods

hiding internal services from outside world to ensure the correct high-level service is being used [closed]

由 前提是你 提交于 2019-12-13 07:59:54
问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 2 months ago . I am working on an e-commerce website. I have advertisement entity which include both properties and photos. Properties are written to DB and photos are stored in file system. I have created a WriterService in my infrastructure project, this service is responsible to save an ad... under the hood

Javascript object property not in scope

由 送分小仙女□ 提交于 2019-12-13 05:36:59
问题 I seem to have a problem with objects' properties' scope. I would like to output each of the Message objects' title and message properties to a select element, but it is Not Working ! What am I doing incorrectly <html><head> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.5.0/jquery.min.js"></script> <script type="text/javascript"> $(function(){ function Message(title, message) { this.title=title; this.message=message; this.getTitle = function(){ return this

responsibility of each class and how they interact each other in UML

由 纵饮孤独 提交于 2019-12-13 03:32:14
问题 I'm trying to draw an class diagram for my project management software describing the following scenario. It contains project Manager Employee Manager can create project manager can change project deadline manager can change project name manager can assign a employee To Project (single project have only one assigned employee) employee can submit project For the above requirements created this Class diagram and implement it in code using php as shown below Class Manager { private $Id; private

Information-hiding in Groovy (using closures? naming conventions?)

由 空扰寡人 提交于 2019-12-13 02:47:02
问题 This follows from my unsuccessful attempt to find an answer to this question from 2014. It's not clear to me whether there might in fact be some techniques in Groovy to use closures, specifically, to hide information. All I can say is that if information on such techniques is out there it is a perfect illustration, precisely, of "information-hiding": I cannot find it! But failing that I think my understanding now is that absolutely zero attempt to hide information (or pretend to, as in Java -
订阅 encapsulation