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Using reflection on Java classes to access all field, methods, and so on:
Is there a standardized order of these elements (which is specified in some standard)?
Of course, I could check it empirically, but I need to know if it's always the same.
EDIT:
I waited for the question: What I need the order for ;)
Long story short: I have JAXB-annotated classes, and want no represent these classes visually. While the order of XML attributes is neither relevant for the XML standard, nor for JAXB, I want to have a certain order the XML attributes for the visual representation.
For example: start comes after end. This hurts one's intuition.
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Reflection is a feature in the Java programming language. It allows an executing Java program to examine or "introspect" upon itself, and manipulate internal properties of the program. For example, it's possible for a Java class to obtain the names of all its members and display them.
Yes, it matters for local classes.
The getConstructors() method is used to get the public constructors of the class to which an object belongs. The getMethods() method is used to get the public methods of the class to which an object belongs.
Overview. Method Parameter Reflection support was added in Java 8. Simply put, it provides support for getting the names of parameters at runtime. In this quick tutorial, we'll take a look at how to access parameter names for constructors and methods at runtime – using reflection.
Reflection of Java Methods The Method class provides various methods that can be used to get information about the methods present in a class. For example, In the above example, we are trying to get information about the methods present in the Dog class.
The required classes for reflection are provided under java.lang.reflect package. Reflection gives us information about the class to which an object belongs and also the methods of that class which can be executed by using the object.
In Java, we achieve this by using the Java Reflection API. It allows us to inspect the elements of a class such as fields, methods or even inner classes, all at runtime. This tutorial will focus on how to retrieve the fields of a Java class, including private and inherited fields. 2. Retrieving Fields from a Class
It is possible to access the private methods and fields of a class using reflection. Thus, reflection may leak important data to the outside world, which is dangerous.
According to the documentation:
getFields()
Returns an array containing Field objects reflecting all the accessible public fields of the class or interface represented by this Class object. The elements in the array returned are not sorted and are not in any particular order. This method returns an array of length 0 if the class or interface has no accessible public fields, or if it represents an array class, a primitive type, or void.
getMethods()
Returns an array containing Method objects reflecting all the public member methods of the class or interface represented by this Class object, including those declared by the class or interface and those inherited from superclasses and superinterfaces. Array classes return all the (public) member methods inherited from the Object class. The elements in the array returned are not sorted and are not in any particular order. This method returns an array of length 0 if this Class object represents a class or interface that has no public member methods, or if this Class object represents a primitive type or void.
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