getter-setter | 易学教程

(no) Properties in Java?

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问题 So, I have willfully kept myself a Java n00b until recently, and my first real exposure brought about a minor shock: Java does not have C# style properties! Ok, I can live with that. However, I can also swear that I have seen property getter/setter code in Java in one codebase, but I cannot remember where. How was that achieved? Is there a language extension for that? Is it related to NetBeans or something? 回答1: There is a "standard" pattern for getters and setters in Java, called Bean

Determine if a JavaScript property has a getter or setter defined?

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问题 Is it possible, given an object and property name to determine if that property is defined using either a getter or setter, or is it completely transparent? I only want to define a getter/setter if there is not already one defined on the property. I need it to work in WebKit/Firefox. 回答1: I think you're looking for getOwnPropertyDescriptor ? https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor 回答2: You can use Object.getOwnPropertyDescriptor(obj

Getters, setters, and properties best practices. Java vs. C#

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问题 I'm taking a C# class right now and I'm trying to find out the best way of doing things. I come from a Java background and so I'm only familiar with Java best-practices; I'm a C# novice! In Java if I have a private property, I do this; private String name; public void setName(String name) { this.name = name; } public String getName() { return this.name; } In C#, I see that there are many ways of doing this. I can do it like Java: private string name; public void setName(string name) { this

How to write C++ getters and setters

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问题 If I need to write a setter and/or getter for a property I write it like this: struct X { /*...*/}; class Foo { private: X x_; public: void set_x(X value) { x_ = value; } X get_x() { return x_; } }; However I have heard that this is the Java style of writing setters and getters and that I should write it in C++ style. Moreover I was told it is ineficient and even incorrect. What does that mean? How can I write the setters and getters in C++? Assume the need for getters and/or setters is

AngularJS ng-model-options getter-setter

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问题 I've just upgrade to angular version 1.3.8. When using 1.2.23 version I've created a directive to convert the data form view to model and vice verse. This is my directive: .directive('dateConverter', ['$filter', function ($filter) { return { require: 'ngModel', link: function (scope, element, attrs, ngModelController) { // Convert from view to model ngModelController.$parsers.push(function (value) { return $filter('date')(new Date(date), 'yyyy-MM-ddTHH:mm:ss') }); // Convert from model to

Property getters and setters

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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 } } // ... } GoZoner Setters and Getters apply to computed properties ; such properties do not have storage in the instance - the value from the getter is meant to be computed from other instance properties. In your case, there is no x to be assigned.

Why doesn't JAXB generate setters for Lists

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问题 When I generate JAXB classes from an XSD, the elements with maxOccurs="unbounded" gets a getter method generated for them, but no setter method, as follows: /** * Gets the value of the element3 property. * * <p> * This accessor method returns a reference to the live list, * not a snapshot. Therefore any modification you make to the * returned list will be present inside the JAXB object. * This is why there is not a <CODE>set</CODE> method for the element3 property. * * <p> * For example, to

Property getter/setter have no effect in Python 2

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问题 I'm a bit confused about properties in python. Consider the following code class A: @property def N(self): print("A getter") return self._N @N.setter def N(self,v): print("A setter") self._N = v def __init__(self): self._N = 1 class B: @property def N(self): print("B getter") return self.a.N @N.setter def N(self,v): print("B setter") self.a.N = v def __init__(self): self.a = A() if __name__ == '__main__': b=B() b.N = 2 print(b.N, b.a.N) b.N = 3 print(b.N, b.a.N) B should be something like a

Java Getters and Setters

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问题 Is there a better standard way to create getters and setters in Java? It is quite verbose to have to explicitly define getters and setters for each variable. Is there a better standard annotations approach? Does Spring have something like this? Even C# has properties. 回答1: I'm not sure if you'd consider it 'standard', but Project Lombok addresses this problem. They use annotations to replace much of the verbosity of Java. Some people are looking at alternative Java sibling languages, such as

c#: getter/setter

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问题 I saw something like the following somewhere, and was wondering what it meant. I know they are getters and setters, but want to know why the string Type is defined like this. Thanks for helping me. public string Type { get; set; } 回答1: Those are Auto-Implemented Properties (Auto Properties for short). The compiler will auto-generate the equivalent of the following simple implementation: private string _type; public string Type { get { return _type; } set { _type = value; } } 回答2: That is an