I am trying implement the Data transformation using Reflection1 example in my code. The GetSourceValue function has a switch comparing various types, but I want to remove these types...
Due to the implementation of Java generics, you can’t have code like this: public class GenSet<E> { private E a; public GenSet() { a = new E[INITIAL_ARRAY_LENGTH]; // error:...
What’s the best way to call a generic method when the type parameter isn’t known at compile time, but instead is obtained dynamically at runtime? Consider the following sample...
What is reflection, and why is it useful? I’m particularly interested in Java, but I assume the principles are the same in any language. 2 23 The name reflection...
The name reflection is used to describe code which is able to inspect other code in the same system (or itself). For example, say you have an object of...
Java Reflection – Object is not an instance of declaring class
I have to ask a question in return: is your GenSet “checked” or “unchecked”? What does that mean? Checked: strong typing. GenSet knows explicitly what type of objects it contains (i.e. its constructor was...
After type erasure, all that is known about T is that it is some subclass of Object. You need to specify some factory to create instances of T. One approach could use a Supplier<T>:...
Like answered before, you should use: Object value = field.get(objectInstance); Another way, which is sometimes prefered, is calling the getter dynamically. example code: public static Object runGetter(Field field, BaseValidationObject...