CODEWITHSUNDEEP
javareflectiondynamic
yyy
yyy

Reputation: 425

How to create Java classes Dynamically by Java Reflection?

Reflection is used to load java class classes and manipulate them on the fly. But I have across a weird question that is asking me how to create Java classes on the fly by Reflection.I mean the classes is not compiled or have source code till we want them created. Is it really possible? Any examples?

Upvotes: 0

Views: 3717

Answers (4)

anubhava
anubhava

Reputation: 786031

You can take a look look at Bean Shell's eval method It lets you execute any Java code on the fly without the need to compile the code into bytecode. You can pass a string containing all the Java code for your class to it's eval method and you'll get back an instance of the dynamically created class. Let me know if you're interested in it and want me to give you an example.

Upvotes: 2

seahorse
seahorse

Reputation: 2470

You can try ASM ASM

or Byte code engineering library

Byte code engineering library

for manipulating, creating classes at run time

In .NET we have Reflection.Emit(C#) which can do that Reflection.Emit

Not sure whether there is a direct java equivalent. You can see another similar question on SO here Java equivalent of reflection.emit

Upvotes: 0

Kurt Du Bois
Kurt Du Bois

Reputation: 7665

Seems to me you don't need reflection, but just need to call the JavaCompiler directly from your code: JavaCompiler.

Upvotes: 1

Kris
Kris

Reputation: 5792

Maybe Apache DynaBeans will do. You can find some tutorials on creating and manipulating them eg. here: http://www.javaranch.com/journal/2003/07/TouringTheCommonsPart1.html

Upvotes: 0

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