reflection

问题 When I serialize my JSON object out of DocumentDB, my Control is not deserializing into the OptionsControl with the Options property. I have the following class, Control : public class Control : IControl { public Guid Id { get; set; } public virtual Enums.ControlType Type { get; set; } public string PropertyName { get; set; } public string ControlCssClass { get; set; } public string Description { get; set; } } I also have OptionsControl , which inherits from Control : public class

问题 How to get the variables name declared within a method in java class? for eg: public class A { String x; public void xyz(){ int i; String z = null; //some code here } Method[] methods = A.class.getDeclaredMethods(); for (Method q = methods){ //some code here to get the variables declared inside method (i.e q) } } How can i do that? Thanks in advance.. 回答1: To paraphrase another answer, There's no (simple) way to do this with with reflection . There is a way to do it. You need a full Java

问题 How to get the variables name declared within a method in java class? for eg: public class A { String x; public void xyz(){ int i; String z = null; //some code here } Method[] methods = A.class.getDeclaredMethods(); for (Method q = methods){ //some code here to get the variables declared inside method (i.e q) } } How can i do that? Thanks in advance.. 回答1: To paraphrase another answer, There's no (simple) way to do this with with reflection . There is a way to do it. You need a full Java

问题 Was using org.reflections API to find that it doesn't work with Enums : List<ClassLoader> classLoadersList = new LinkedList<>(); classLoadersList.add(ClasspathHelper.contextClassLoader()); classLoadersList.add(ClasspathHelper.staticClassLoader()); Reflections reflections = new Reflections(new org.reflections.util.ConfigurationBuilder() .setScanners(new SubTypesScanner(false), new ResourcesScanner()) .setUrls(ClasspathHelper.forClassLoader(classLoadersList.toArray(new ClassLoader[0])))

问题 import scala.reflect.runtime.universe._ val a: 42 = 42 val t: Type = typeOf[a.type] assert(getConstantType(t).get =:= typeOf[42]) def getConstantType(t: Type): Option[ConstantType] = ??? How could I generally implement getConstantType so that the above assertion passes? I assumed that something like this was possible since the assertion below passes: assert(t <:< typeOf[42]) t.widen goes too far as it return Int . I'm looking for something that returns Int(42) . 回答1: How about assert(t

问题 import scala.reflect.runtime.universe._ val a: 42 = 42 val t: Type = typeOf[a.type] assert(getConstantType(t).get =:= typeOf[42]) def getConstantType(t: Type): Option[ConstantType] = ??? How could I generally implement getConstantType so that the above assertion passes? I assumed that something like this was possible since the assertion below passes: assert(t <:< typeOf[42]) t.widen goes too far as it return Int . I'm looking for something that returns Int(42) . 回答1: How about assert(t

问题 Currently, one can use __PRETTY_FUNCTION__ to display a template type under gcc , and clang : #include <iostream> template <class T> void print_type() { std::cout << __PRETTY_FUNCTION__ << std::endl; } int main(int argc, char* argv[]) { print_type<const volatile int&>(); return 0; } Will output: void print_type() [with T = const volatile int&] With the reflection TS coming and reflection facilities in C++, I was wondering what the syntax would look like to be able to do something similar.

问题 Effective Java 2nd describes the Enum Implementation as the best practice to implement a Singleton in Java. But the advantage of that implementation against the Static Holder Implementation is that the enum can prevent the reflection attack. So, there comes the question: Why do we need to prevent the reflection attack of singleton? The other implementations of Java Singleton are just resolving the issues of multiple threads and lazy initialization . These problems will and often appear at the

问题 So I have a Generic class (it's mostly a container class) with implicit casting, like this: public class Container<T> { public T Value { get; set; } public static implicit operator T(Container<T> t) { return t.Value; } public static implicit operator Container<T>(T t) { return new Container<T>() { Value = t }; } } So in runtime I would like to cast an instance of Container<int> to int using reflection but cannot seem to find a way, I've tried the "Cast" method invoking mentioned in a couple

问题 I've taken a class file(say Foo.class ) using JFileChooser and stored it in a File class object(say File a ). now I've to read metadata like methods and variables of this Foo.class using reflection APIs. My question is that, I've stored it in a , which is just a File reference variable . So how can I use any API on a File. or any other suggestion for doing so are also welcomed. 回答1: as i understand,first of all you need to convert class file to Class object you can do that via UrlClassLoader