How to get function parameter names/values dynamically?
How to get function parameter names/values dynamically?
reflection
How do I get the path of the assembly the code is in?
How do I get the path of the assembly the code is in?
How to read the value of a private field from a different class in Java?
In order to access private fields, you need to get them from the class’s declared fields and then make them accessible: Field f = obj.getClass().getDeclaredField(“stuffIWant”); //NoSuchFieldException f.setAccessible(true); Hashtable iWantThis = (Hashtable) f.get(obj); //IllegalAccessException EDIT: as has been commented by aperkins, both accessing the field, setting it as accessible and retrieving the value can throw Exceptions, … Read more
How can I add reflection to a C++ application?
What you need to do is have the preprocessor generate reflection data about the fields. This data can be stored as nested classes. First, to make it easier and cleaner to write it in the preprocessor we will use typed expression. A typed expression is just an expression that puts the type in parenthesis. So … Read more
How to get the list of properties of a class?
Reflection; for an instance: obj.GetType().GetProperties(); for a type: typeof(Foo).GetProperties(); for example: class Foo { public int A {get;set;} public string B {get;set;} } … Foo foo = new Foo {A = 1, B = “abc”}; foreach(var prop in foo.GetType().GetProperties()) { Console.WriteLine(“{0}={1}”, prop.Name, prop.GetValue(foo, null)); } Following feedback… To get the value of static properties, pass … Read more
Change private static final field using Java reflection
Assuming no SecurityManager is preventing you from doing this, you can use setAccessible to get around private and resetting the modifier to get rid of final, and actually modify a private static final field. Here’s an example: import java.lang.reflect.*; public class EverythingIsTrue { static void setFinalStatic(Field field, Object newValue) throws Exception { field.setAccessible(true); Field modifiersField … Read more
Can you find all classes in a package using reflection?
Due to the dynamic nature of class loaders, this is not possible. Class loaders are not required to tell the VM which classes it can provide, instead they are just handed requests for classes, and have to return a class or throw an exception. However, if you write your own class loaders, or examine the … Read more
How do I invoke a Java method when given the method name as a string?
Coding from the hip, it would be something like: java.lang.reflect.Method method; try { method = obj.getClass().getMethod(methodName, param1.class, param2.class, ..); } catch (SecurityException e) { … } catch (NoSuchMethodException e) { … } The parameters identify the very specific method you need (if there are several overloaded available, if the method has no arguments, only give … Read more
Get generic type of class at runtime
As others mentioned, it’s only possible via reflection in certain circumstances. If you really need the type, this is the usual (type-safe) workaround pattern: public class GenericClass<T> { private final Class<T> type; public GenericClass(Class<T> type) { this.type = type; } public Class<T> getMyType() { return this.type; } }
Get property value from string using reflection
public static object GetPropValue(object src, string propName) { return src.GetType().GetProperty(propName).GetValue(src, null); } Of course, you will want to add validation and whatnot, but that is the gist of it.