Listing all the subclasses of a specific class in Java

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How do I list down all the subclasses of a specific class or all the implementers of a specific interface in Java? Using Eclipse, I am able to do so but I want to know how to perform this programmatically? If you have any suggestions, please do put them.

Jun 7, 2018 in Java by code.reaper12
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There is a simple library available for this purpose: org.reflections

This will scan your classpath, index the metadata, allow you to query it on runtime and may save and collect that information for many modules within your project.

Using Reflections you can query your metadata such as:

  • get all subtypes of some type

  • get all types/constructors/methods/fields annotated with some annotation, optionally with annotation parameters matching

  • get all resources matching a regular expression

  • get all methods with specific signature including parameters, parameter annotations, and return type

  • get all methods parameter names

  • get all fields/methods/constructors usages in code

You just need to call the following to fulfill your task:

reflections.getSubTypesOf(aClazz))

answered Jun 7, 2018 by geek.erkami
• 2,320 points

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