How to find all the classes of a package in Java

Question

In my project I need to find all the classes of certain packages: what is the best way to do this?

Answer 1

Looking on internet I found this page with an example and it works on Java version ranging from 8 to 16: what do you think about?

Answer 2

Hello @Juan ,

You could use Reflections:

    private Class<?>[] scanForTasks(String packageStr) {
        Reflections reflections = new Reflections((new ConfigurationBuilder()).setScanners(new Scanner[]{new SubTypesScanner(), new TypeAnnotationsScanner()}).setUrls(ClasspathHelper.forPackage(packageStr, new ClassLoader[0])).filterInputsBy((new FilterBuilder()).includePackage(packageStr)));
        Set classes = reflections.getTypesAnnotatedWith(Task.class);
        Class[] taskArray = (Class[])classes.toArray(new Class[classes.size()]);
        return taskArray;
    }
}

Comments

But does it work on Java 9 and later?

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Yes,it should work!!