nested-class

问题 This question is about interesting behavior of Java: it produces additional (not default) constructor for nested classes in some situations. This question is also about strange anonymous class, which Java produces with that strange constructor. Consider the following code: package a; import java.lang.reflect.Constructor; public class TestNested { class A { A() { } A(int a) { } } public static void main(String[] args) { Class<A> aClass = A.class; for (Constructor c : aClass

问题 Which one is more acceptable (best-practice)?: namespace NP public static class IO public static class Xml ... // extension methods using NP; IO.GetAvailableResources (); vs public static class NP public static class IO public static class Xml ... // extension methods NP.IO.GetAvailableResources (); Also for #2 , the code size is managed by having partial classes so each nested class can be in a separate file, same for extension methods (except that there is no nested class for them) I prefer

问题 I have a control circuit which has multiple settings and may have any number of sensors attached to it (each with it's own set of settings). These sensors may only be used with the control circuit. I thought of using nested classes like so: public class ControlCircuitLib { // Fields. private Settings controllerSettings; private List<Sensor> attachedSensors; // Properties. public Settings ControllerSettings { get { return this.controllerSettings; } } public List<Sensor> AttachedSensors { get {

问题 Let's say I have: class A { public: class B { }; }; Is there any difference between that public nested class and just a regular B class which is defined in its own cpp file, except for the fact that A::B must be used in the first option? 回答1: There is essentially no difference, except that A::B is a member of A , and so has all the access rights to private members of A that any other member would have. 回答2: There isn't any difference other than the scoping rules for "B". Clients that use "B"

问题 Is there a way to refer to a non-static field of an outer class from a static nested class? Please see my code below: public class TestComponent { String value; public void initialize(String value) { this.value = value; } public static class TestLabel extends GenericForwardComposer { Label testLabel; @Override public void doAfterCompose(Component comp) throws Exception { super.doAfterCompose(comp); testLabel.setValue(value); } } } This code throws an error at testLabel.setValue(value) as I am

问题 is this possible to somehow, have this scenario, where A.N inherits code from A with this code example? The reason for setting it up like this, is that I need multiple classes that inherit from Base<TType> and the Nested : Base<TType> where the server has the base only, and the client has the extended Nested. This way, it would be easy to use the code, where they would have some shared code between themselves & each other. The problem is that I would have to write identical code inside the A

问题 I have a project in cakephp, when I call a vendor for decrypting a string using AES, I get the error: Fatal error: Class declarations may not be nested in /var/www/html/myproject/cake/libs/log/file_log.php on line 30 This is the code in my controller: App::import('vendor', 'aes', array('file' => 'AES/AES.php')); $aes = new AesCtr(); $decrypted = $aes->decrypt($encrypted, "mykey", 128); And this is part of the vendor (one single file called AES.php): class Aes { //....Methods } class AesCtr

问题 I have a query regarding accessibility of top level class from member inner class. I have just read the reason why local or anonymous inner classes can access only final variables.The reason being JVM handles these two classes as entirely different classes and so, if value of variable in one class changes, it can't be reflected at run time in another class file. Then, my question is that how an inner member class (non-static) can have access to members to members of top level class, as JVM is

问题 I want to specify variable once by making instance Outer(variable), than this variable use in all static classes, how should I do that? Is there any other solution than use not static methods and pass Outer into each inner class? class Outer(): def __init__(self, variable): self.variable= variable class Inner1(): @staticmethod def work1(): **print Outer.variable** class Inner2(): @staticmethod def work2(): **print Outer.variable** 回答1: No. Inner-class methods have no way of accessing

问题 suppose we have: Class Outer Public Shared Index As Integer Class Inner Private Index As Integer Public Shared Sub Test() ' how do I refer to the parent's Index? End Sub End Class End Class then I can't use MyBase because it's not derived and I can't pass the instance of the parent to Inner's constructor because Test is shared... I also cannot refer to it as Outer.Index because Outer doesn't yet exist at the time Inner is getting compiled, and of course, in a simple reference the referenced