inner-classes

问题 This question already has answers here : What is the meaning of “static synthetic”? (3 answers) Closed 6 years ago . Can someone explain in an easy to understand way the importance of synthetic fields in Java. I recall reading it in context of non static inner classes where each such inner class instance maintains a reference to the enclosing class. Why are such references/fields called synthetic fields? 回答1: A synthetic field is a compiler-created field that links a local inner class to a

问题 In java Program, parameters which is defined as String in method declaration. But in method definition it is accessed as final String variable. Whether it'll lead to some issues (like security, memory problem)? For Example: Method Declaration join(String a,String b); Method definition public void join(final String a,final String b) { Authenticator au = new Authenticator(){ public PasswordAuthentication getPasswordAuthentication(){ return new PasswordAuthentication(a,b)} }; } Please help for

问题 In java Program, parameters which is defined as String in method declaration. But in method definition it is accessed as final String variable. Whether it'll lead to some issues (like security, memory problem)? For Example: Method Declaration join(String a,String b); Method definition public void join(final String a,final String b) { Authenticator au = new Authenticator(){ public PasswordAuthentication getPasswordAuthentication(){ return new PasswordAuthentication(a,b)} }; } Please help for

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . Does anyone know of any tool to convert Java 8 code (at the source level) that uses lambdas and method references into Java 7 code that uses anonymous inner classes? I know about Retrolambda, but that works at the bytecode level, not the source level. For now, I have a version working that works as an IntelliJ

问题 I didn't imagine that I would encounter radically new syntax in Java anymore at this stage, but lo and behold, I just encountered something: The exact context and what the code below should do is pretty irrelevant - it's there just to give some kind of context. I'm trying to synthetically create an event in IT Mill Toolkit, so I wrote this kind of line: buttonClick(new Button.ClickEvent(button)); But, Eclipse gives me the following error message: No enclosing instance of type Button is

问题 I didn't imagine that I would encounter radically new syntax in Java anymore at this stage, but lo and behold, I just encountered something: The exact context and what the code below should do is pretty irrelevant - it's there just to give some kind of context. I'm trying to synthetically create an event in IT Mill Toolkit, so I wrote this kind of line: buttonClick(new Button.ClickEvent(button)); But, Eclipse gives me the following error message: No enclosing instance of type Button is

问题 I have a class Actions with an Enum in it [DataContract] public class Actions { [DataContract] public enum MailDirectLinkContent { [EnumMember] [DescriptionAttribute("Second account holder")] SecondAccountHolder = 0, [EnumMember] [DescriptionAttribute("Legal representative")] LegalRepresentative = 1, [EnumMember] [DescriptionAttribute("Authorized representative")] AuthorizedRepresentative = 2 } } In my wcf-service I have a method [OperationContract] void DoActionMailDirectLinkContent(string

问题 I have a class CFoo with a private inner class CBar. I want to implement a stream ouput operator for CFoo, which in turn uses a stream output for CBar in it's implementation. I can get this working when CFoo is in the common namespace, but when i place it in a new namespace (namespace foobar), the operator can no longer access the private inner class. I suspect this has something to do with the full signature of the operator, but I can't figure out the correct way to specify the friend

问题 When I tried to understand how to work with collections in java, I realised that I don't understand how polymorphism works for inner classes. Simple code example: class Parent { public static void main(String[] args) { new Parent().newInnerClass().myMethod(); new Child().newInnerClass().myMethod(); } public I newInnerClass() { return new InnerClass(); } private final class InnerClass implements I { @Override public void myMethod() { System.out.println("parent inner class"); foo(); } } public

问题 The dummyNode declaration variable was working well until i wrote iterator class as nested, now it gives me an error invalid use of non-static data member, 'linkedList::dummyNode' c++, if i removed iterator class it works well template class linkedList { private: listNode<T> * head, *tail; listNode<T> * dummyNode = new listNode<T>; int sz = 0; public: class iterator { public: iterator() { itrNode = head; } void operator ++ () { try{ if(itrNode == dummyNode) throw "Sorry this is the end of the