Java Reflection Tutorial for Classes, Constructors, Annotations, Methods, Fields, and Hacking fun. . .

Java Reflection Tutorial

Reflection is the ability for a class or object to examine itself at runtime. In addition, reflection lets Java look at the class of the object and determine its structure. As defined by the security manager, you will be able to find out the constructors, interfaces, methods, annotations, and fields a class has as well as its attributes. In addition, you can change the value of fields, invoke methods, and invoke new objects.

Put another way, reflection allows us to do the following:

  • We can construct objects dynamically at runtime
  • Gather details about an object’s class
  • Determine a class’s structure at runtime (name, fields, methods)
  • Change the values of a class’s fields
  • Invoke an objects methods at runtime

Although there are many Java Reflection Tutorials available online, I hope that this Java Reflection Tutorial will give you a deeper understanding of how you can use many of the features available.

If you have been around for a short while and are familiar with Java and the tools used in the industry then you have already been using Reflection by some of these tools and applications.

Tools using Reflection

  • Spring (For Dependency Injection)
  • The Eclipse IDE
  • JUnit (for annotation)
  • Hibernate

In this Java Reflection Tutorial series, we will discuss many of the different aspects of Java Reflection API.

Java Reflection Examples

  • Class Example
    Simple example shows you how to dynamically load and instantiate a class, get class name, package name, and superclass name.
  • Modifier Example
    Showing you how to get information about classes, fields and methods using modifier method.
  • Method Example
    Providing full details of how to get all methods, and invoke methods using reflection.

Frequently Asked Questions on Java Reflection API (FAQs)

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