access-levels | 易学教程

Java define a explicit package-private modifier [closed]

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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 . Improve this question Obviously Java has a Access level package-private which achieved by not adding any explicit modifier. But isn't there a way to explicitly add this modifier? It's a bit confusing that we need to omit access level when we want to use member in package only

Java define a explicit package-private modifier [closed]

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How to hide a protected procedure of an object?

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问题 In one base class, there's a protected procedure. When inheriting that class, I want to hide that procedure from being used from the outside. I tried overriding it from within the private and even strict private sections, but it can still be called from the outside. The Original class is not mine, so I can't change how TOriginal is defined. Is it possible to hide this procedure in my inherited class? And how? type TOriginal = class(TObject) protected procedure SomeProc; end; TNew = class

Are protected members/fields really that bad?

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问题 Now if you read the naming conventions in the MSDN for C# you will notice that it states that properties are always preferred over public and protected fields. I have even been told by some people that you should never use public or protected fields. Now I will agree I have yet to find a reason in which I need to have a public field but are protected fields really that bad? I can see it if you need to make sure that certain validation checks are performed when getting/setting the value

Common CMS roles and access levels

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问题 I am currently writing a CMS and remember someone (it might have been on here) criticise the existing CMS for not having a robust enough user permissions system. I've got a method planned out but it I feel it has fallen into the usual trap of being a bit too fine-grained which makes understanding and implementing it a horror for end users. I think having a range of default user roles with permissions would be the answer to this, so I suppose my question is this: What are the default roles you

access exception when invoking method of an anonymous class using java reflection

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问题 I'm trying to use an event dispatcher to allow a model to notify subscribed listeners when it changes. the event dispatcher receives a handler class and a method name to call during dispatch. the presenter subscribes to the model changes and provide a Handler implementation to be called on changes. Here's the code (I'm sorry it's a bit long). EventDispacther: package utils; public class EventDispatcher<T> { List<T> listeners; private String methodName; public EventDispatcher(String methodName

access exception when invoking method of an anonymous class using java reflection

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I'm trying to use an event dispatcher to allow a model to notify subscribed listeners when it changes. the event dispatcher receives a handler class and a method name to call during dispatch. the presenter subscribes to the model changes and provide a Handler implementation to be called on changes. Here's the code (I'm sorry it's a bit long). EventDispacther: package utils; public class EventDispatcher<T> { List<T> listeners; private String methodName; public EventDispatcher(String methodName) { listeners = new ArrayList<T>(); this.methodName = methodName; } public void add(T listener) {

Java Protected Access Not Working

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问题 In java, there's three levels of access: Public - Open to the world Private - Open only to the class Protected - Open only to the class and its subclasses (inheritance). So why does the java compiler allow this to happen? TestBlah.java: public class TestBlah { public static void main(String[] args) { Blah a = new Blah("Blah"); Bloo b = new Bloo("Bloo"); System.out.println(a.getMessage()); System.out.println(b.getMessage()); //Works System.out.println(a.testing); System.out.println(b.testing);

C# compile error: “X is inaccessible due to its protection level”

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问题 when c# gives this compile error? 'Favorite.Favorites.FavoriteCollection' is inaccessible due to its protection level private void Form1_Load(object sender, EventArgs e) { Favorites objFavorites = new Favorites(); objFavorites.ScanFavorites(); foreach (WebFavorite objWebFavorite in objFavorites.FavoriteCollection) { ListViewItem objListViewItem = new ListViewItem(); objListViewItem.Text = objWebFavorite.Name; objListViewItem.SubItems.Add(objWebFavorite.Url); lstFavorites.Items.Add

How to restrict access to nested class member to enclosing class?

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Is it possible to specify that members of a nested class can be accessed by the enclosing class, but not other classes ? Here's an illustration of the problem (of course my actual code is a bit more complex...) : public class Journal { public class JournalEntry { public JournalEntry(object value) { this.Timestamp = DateTime.Now; this.Value = value; } public DateTime Timestamp { get; private set; } public object Value { get; private set; } } // ... } I would like to prevent client code from creating instances of JournalEntry , but Journal must be able to create them. If I make the constructor