getter-setter

问题 When dealing with buisness classes, like the typical Customer and Employee classes, is it better to use getters and setters only or to use properties? I am translating to Delphi (for self learning) some OO examples from java books, in those examples there is always GetName() and SetName(), properties are not used. Now, I can see that if I create a component with published properties I have a very good reason for using properties, but in normal classes, which approach is better? Is the code

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 2 years ago . I know how getter and setter work in JavaScript. What I don't understand is why we need them when we can get the same result using normal functions? Consider the following code: var person = { firstName: 'Jimmy', lastName: 'Smith', get fullName() { return this.firstName + ' '

问题 Can someone please help me understand the significance of the '_' character in the setters and getters of javascript. For example I have the following code which works fine. var user = { get name() { return this._name; }, set name(value) { this._name = value; } }; var me = user; me.name = "Rob"; alert(me.name); But if I remove the underscore so my code will look like the following, then my code won't work and I get a an error in the browser console stating "RangeError: Maximum call stack size

问题 In Java, for example, I can write getters on my own (generated by IDE) or use Annotations like @Getter in lombok - which was pretty simple. Kotlin however has getters and setters by default. But I can't understand how to use them. I want to make it, lets say - similar to Java: private val isEmpty: String get() = this.toString() //making this thing public rises an error: Getter visibility must be the same as property visibility. So how do getters work? 回答1: Getters and setters are auto

问题 I have been programming in C# for a while and now I want to brush up on my C++ skills. Having the class: class Foo { const std::string& name_; ... }; What would be the best approach (I only want to allow read access to the name_ field): use a getter method: inline const std::string& name() const { return name_; } make the field public since it's a constant Thanks. 回答1: It tends to be a bad idea to make non-const fields public because it then becomes hard to force error checking constraints

问题 With this simple class I am getting the compiler warning Attempting to modify/access x within its own setter/getter and when I use it like this: var p: point = Point() p.x = 12 I get an EXC_BAD_ACCESS. How can I do this without explicit backing ivars? class Point { var x: Int { set { x = newValue * 2 //Error } get { return x / 2 //Error } } // ... } 回答1: Setters and Getters apply to computed properties ; such properties do not have storage in the instance - the value from the getter is meant

问题 This question already has answers here : Why use getters and setters/accessors? (38 answers) Closed 3 years ago . I have been taught to always use getters and setters. However, I don't know the pros and cons of these methods, as by implementing them we are exposing the data and also hiding it. I am a little confused about this. Can anybody give some proper advice on why we use a getter/setter and what the advantages are? 回答1: The basic "private field with public getter and setter that do

问题 If I use simple Alpha color effects on an instance on the stage, how do I access it via JSFL? An instance's *.colorAlphaAmount and *.colorAlphaPercent doesn't access the above illustration's value. It's only useful for "Advanced Color" effects. It looks like fl.getDocumentDOM().setInstanceAlpha(18); can SET the alpha property, but NOT GET it. Also, this method would assume that the instance is selected in the current timeline / layer / frame, which I likely wouldn't (since I'm iterating

问题 import operator import re from ply import lex, yacc class Lexer(object): tokens = [ 'COMMA', 'TILDE', 'PARAM', 'LP', 'RP', 'FUNC' ] # Regular expression rules for simple tokens t_COMMA = r'\,' t_TILDE = r'\~' t_PARAM = r'[^\s\(\),&:\"\'~]+' def __init__(self, dict_obj): self.dict_obj = dict_obj def t_LP(self, t): r'\(' return t def t_RP(self, t): r'\)' return t def t_FUNC(self, t): # I want to generate token for this FUNC from the keys of model map # For eg: r'key1|key2' r'(?i)FUNC' return t

问题 I'm having two model Classes public class Person { public int PersonId { get; set; } public string Name { get; set; } public int AddressId { get; set; } public Address AddressInfo { get; set; } } public class Address { public int AddressId { get; set; } public string streetName { get; set; } public string City { get; set; } public string State { get; set; } } If any value gets update in Person.AddressInfo.AddressId, update the Person.AddressId automatically. Kindly assist me how to update