#Java reflection use case how to
#Java reflection use case software
#Java reflection use case code
#Java reflection use case professional
#Java reflection use case free

#Java reflection use case code

May java developer don't want to use second option because you want to stay away from native code due to portability issue, but it is worth trying it to see what type of performance we get. There are couple of options ASM, javassist for that. There are some byte code manipulation API that we can use to generate such class. Use some native call to perform reflection.įirst option looks such a naive thing, you don't want to write all that and if your class has lot of function then it become nightmare to maintain it. Go back to normal method call by writing big IF-ELSEIF-ELSE for each method MethodHandles gives good abstraction for reflection, but on performance side it is very slow, so i am sure you want to re think before you use it. There are several reasons: Poor performance Because java's reflection determines types dynamically, it scans the classpath to find the class to load, resulting in slow program. Why shouldn't we use reflection in normal programming when we already have access to interfaces and classes.

#Java reflection use case software

LinkedIn (mostly sharing about software engineering news and tutorials, fair IT, ethics in tech and AI, career.Wow it is very very slow 106X times slow compared reflection, i don't want to compare with with normal method call. Limitations when working with reflection in Java.

JetBrains Academy: learn Java, Python, Kotlin, web development. extension as a pure Java library, using the Java Core Reflection mechanism and bytecode gener.

Its also used at a lower level by object serialization to tear.

#Java reflection use case free

I'm also really interested in the human dimension of tech (accessibility, inclusion, ethics, environment.), and I have way too many ideas of side projects.Įnglish is not my mother tongue and I'm somewhat new to the IT world, I like to improve so feel free to share your thoughts and advice, in a polite way =) Links The reflection API is used by JavaBeans to determine the capabilities of objects at runtime. On the techie side: my favorite stack is Java-Spring Boot-Angular, I do active tech watch to keep up with news in my field, I like taking certifications, lately I've been particularly curious about Cloud, mobile, UX design and AI.

I then decided to try and share knowledge my way, hoping it can help others too. While learning, I found out that the teaching style of a lot of people in tech didn't suit me.

#Java reflection use case professional

I started my career in IT in my early 30s after a change of professional direction. I'm a 30-something software engineer who likes sharing knowledge and learning. Let's go ahead and determine the superclass of Goat.

#Java reflection use case how to

This subsection will show how to obtain this information. In many cases, especially while using library classes or Java's built-in classes, we may not know beforehand the superclass of an object we are using. Here’s the official documentation about Reflection. We are also able to obtain the superclass of any Java class by using Java reflection. Here’s the link to my project on GitHub, that I called “Beautiful String”, so you can have a look at it (and even use it). IDEs debuggers are my first choice even thought they’re made for this very purpose… So thanks to my class I don’t have anymore to redefine toString methods or to output manually the object’s properties, I can show it all with a single liner that would work for most objects. I feel pretty bad for admitting this, but I’m one of those who’d rather use screen outputs to debug. I ended up using Generics, which is also something I hardly knew about before doing the course on JetBrains Academy. It was pretty fun to do this project because not only did I have to play with the Reflection API, but also to solve many problems related to typing and conversions. The class checks only getters that follow the usual Java naming convention (as described in the project). In the same kind of idea, I wanted to create a class that would take an instantiated object and output its fields values only based on public getters. I guess IDEs like IntelliJ and Eclipse make use of the Reflection API for features such as automatically generating getters and setters, override of toString method, parameterized constructors… My project based on Reflection: describing an object with a single liner That is, getting information on constructors, fields, methods, inheritance… of a class at runtime, but also (really dangerous!) to modify them (as for example, setting a field to public at runtime while you set is as private when you wrote your class). One that I totally discovered was the Reflection API, a native Java class that allows accessing and modifying the application at runtime. Thanks to JetBrains Academy/Hyperskill Java Developer track I had the opportunity to dig deeper into advanced concepts in Java.