protected

问题 I have a problem with Twig, (in fact this is not really a problem but it's disturbing to me) I have a Post model class in php and i have some protected variables (I also tried with private ). To acces them I have a public function in php getMyVariable . If in my controller I try to echo the protected variable it throz me an error Cannot access protected property... so I have to use the function to echo my variable. This is totally normal and this is what I want But, then I try to render it in

问题 F# does not support the definition of protected methods. Here it is explained why F# replaces virtual methods with abstract methods defined in abstract classes (see here). I was wondering if there is a way to prevent access to abstract methods from outside the derived classes at all. 回答1: Like Patryk Ćwiek, I also don't think it's possible, but here's one alternative: From Design Patterns we know that we should favour Composition over Inheritance . In my experience, everything you can do with

问题 If I use a protected variable, does the variable exist for the whole web application or does it get removed when the user move to other page by get or post? I do know that it is not accessible in other pages unless I use static variable, but I am curious as to if it exists for the whole application. Please let me know! 回答1: when you move to other page and return, a new instance of your page class will be created and so all non static variables will be reset. The value will be valid in a one

问题 I have an internal abstract class InternalClassBase and two (also internal) classes InternalClass1 and InternalClass2 , which inherit from InternalClassBase . I also have a public abstract class PublicClassBase and two (also public) classes PublicClass1 and PublicClass2 , which inherit from PublicClassBase . The PublicClassBase has a protected member XXX of type InternalClassBase , so both PublicClass1 and PublicClass2 can use it. This is my code: internal abstract class InternalClassBase { }

问题 I have an abstract class with a protected variable abstract class Beverage { protected string description; } I can't access it from a subclass. Intellisense doesn't show it accessible. Why is that so? class Espresso:Beverage { //this.description ?? } 回答1: Short answer: description is a special type of variable called a "field". You may wish to read up on fields on MSDN. Long answer: You must access the protected field in a constructor, method, property, etc. of the subclass. class Subclass {

问题 Why is it that in Java, a superclass' protected members are inaccessible by an indirect subclass in a different package? I know that a direct subclass in a different package can access the superclass' protected members. I thought any subclass can access its inherited protected members. EDIT Sorry novice mistake, subclasses can access an indirect superclasses' protected members. 回答1: Perhaps you're a little confused. Here's my quick demo and shows an indirect subclass accessing a protected

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Protected methods in objective-c The way to declare private properties is simple. You declare that in extension that's declared in .m files. Say I want to declare protected properties and access it from the class and subclass. This is what I tried: // // BGGoogleMap+protected.h // // #import "BGGoogleMap.h" @interface BGGoogleMap () @property (strong,nonatomic) NSString * protectedHello; @end That one is compile

问题 This question already has answers here : What is the difference between public, protected, package-private and private in Java? (28 answers) Closed 4 years ago . Why can't I use protected constructors outside the package for this piece of code: package code; public class Example{ protected Example(){} ... } Check.java package test; public class Check extends Example { void m1() { Example ex=new Example(); //compilation error } } Why do i get the error even though i have extended the class?

问题 Hi I have this array and I am not sure how will I fetch the name , brand, image, token values from it? Gloudemans\Shoppingcart\CartCollection Object ( [items:protected] => Array ( [1264477c2182cc04a63fde1186741fa7] => Gloudemans\Shoppingcart\CartRowCollection Object ( [associatedModel:protected] => [associatedModelNamespace:protected] => [items:protected] => Array ( [rowid] => 1264477c2182cc04a63fde1186741fa7 [id] => 1 [name] => washington apples [qty] => 1 [price] => 90 [options] =>

问题 I was wondering whether it is possible to assign a value to an HTML text box and protect it. What I mean is make it´s content unmodifiable, so that when the form gets submitted im "sure" it was this value which was submitted. BTW I realize the easier way would be not to "listen" fot this input and just assign it but it would come in handy to be able to do what´s stated above. I hope the question is clear enough, please ask for any needed clarification. Thanks in advance! EDIT: I was