getter-setter

Why is it impossible to override a getter-only property and add a setter? [closed]

由 爷，独闯天下 提交于 2019-11-26 12:18:52
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 last year . Why is the following C# code not allowed: public abstract class BaseClass { public abstract int Bar { get;} } public class ConcreteClass : BaseClass { public override int Bar { get { return 0; } set {} } } CS0546 \'ConcreteClass.Bar.set\': cannot override because \'BaseClass

What is the point of setters and getters in java? [duplicate]

由 倖福魔咒の 提交于 2019-11-26 11:21:53
This question already has an answer here: Why use getters and setters/accessors? [closed] 38 answers Please forgive the length, but here are two programs, both the exact same, but one with and one without setters, getters, and constructors. I've taken a basic C++ class before and don't remember any of these from it, and at the moment I'm not seeing the point of them, if anyone could explain them in lamen's terms I'd much appreciate it...at the moment they seem to be nothing more than space wasters to make my code look longer, but the teacher says they are important (and so far that's it).

Is it possible to read the value of a annotation in java?

由 守給你的承諾、 提交于 2019-11-26 11:15:12
this is my code: @Column(columnName="firstname") private String firstName; @Column(columnName="lastname") private String lastName; public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } is it possible to read the value of my annotation @Column( columnName ="xyz123") in another class? Cephalopod Yes, if your Column annotation has the runtime retention @Retention(RetentionPolicy.RUNTIME) @interface Column {

Instance member cannot be used on type

由 巧了我就是萌 提交于 2019-11-26 11:00:56
问题 I have the following class: class ReportView: NSView { var categoriesPerPage = [[Int]]() var numPages: Int = { return categoriesPerPage.count } } Compilation fails with the message: Instance member \'categoriesPerPage\' cannot be used on type \'ReportView\' What does this mean? 回答1: You just have syntax error when saying = {return self.someValue} . The = isn't needed. Use : var numPages: Int { get{ return categoriesPerPage.count } } if you want get only you can write var numPages: Int {

Difference between _ and self. in Objective-C

由 吃可爱长大的小学妹 提交于 2019-11-26 10:16:26
问题 Is there a difference between using the underscore and using the self keyword in Objective-C when calling an @property ? Property declaration: @property (weak, nonatomic) NSString *myString; Calling @synthesize on the property: @synthesize myString = _myString; Is there a difference if I want to use it in my code? When? In the getter/setter? self.myString = @\"test\"; _myString = @\"test\"; 回答1: self.myString = @"test"; is exactly equivalent to writing [self setMyString:@"test"]; . Both of

What is the benefit to using a 'get function' for a python class? [closed]

由 半腔热情 提交于 2019-11-26 09:59:19
问题 For example, in the code below, what is the benefit of the getName function? class Node(object): def __init__(self, name): self.name = str(name) def getName(self): return self.name def __str__(self): return self.name 回答1: There is no benefit. People coming to Python from other languages (e.g., Java) sometimes do this because they're used to it. In Python there is no point to creating these sorts of getters and setters that don't do anything but directly get and set the underlying variable.

Override a setter, and the getter must also be overridden

由 我怕爱的太早我们不能终老 提交于 2019-11-26 09:58:46
问题 class AbstractClass { constructor() { } set property(value) { this.property_ = value; } get property() { return this.property_; } } class Subclass extends AbstractClass { constructor() { super(); } set property(value) { super.property = value; if (!(this.property_ instanceof SubclassAssociatedClass)) throw new TypeError(); } //get property() { // return super.property; //} } Override the set method of an attribute and it appears the get method must be overridden also, otherwise undefined is

Naming convention for getters/setters in Java

由 落爺英雄遲暮 提交于 2019-11-26 08:26:57
问题 if I have the following private member: private int xIndex; How should I name my getter/setter: getXindex() setXindex(int value) or getxIndex() setxIndex(int value) EDIT: or getXIndex() setXIndex(int value); ? 回答1: The correct answer is getxIndex() setxIndex(int value) if you want them to be used as properties according to section 8.8: Capitalization of inferred names of the JavaBeans API specification (e.g. access them via ${object.xIndex} in a JSP. 回答2: In accordance with JavaBeans API

What is the point of setters and getters in java? [duplicate]

由 …衆ロ難τιáo~ 提交于 2019-11-26 03:30:25
问题 This question already has an answer here: Why use getters and setters/accessors? 38 answers Please forgive the length, but here are two programs, both the exact same, but one with and one without setters, getters, and constructors. I\'ve taken a basic C++ class before and don\'t remember any of these from it, and at the moment I\'m not seeing the point of them, if anyone could explain them in lamen\'s terms I\'d much appreciate it...at the moment they seem to be nothing more than space

Is it possible to read the value of a annotation in java?

由 假装没事ソ 提交于 2019-11-26 02:07:52
问题 this is my code: @Column(columnName=\"firstname\") private String firstName; @Column(columnName=\"lastname\") private String lastName; public String getFirstName() { return firstName; } public void setFirstName(String firstName) { this.firstName = firstName; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } is it possible to read the value of my annotation @Column( columnName =\"xyz123\") in another class? 回答1: Yes, if
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