How to get all elements inside a JFrame?

Question

I have this code to get all the elements I need and do some processing. The problem is I need to specify every panel I have to get the elements inside it.

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Answer 1

If you want to find all components of a given type, then you can use this recursive method!

public static  List findComponents(
    final Container container,
    final Class componentType
) {
    return Stream.concat(
        Arrays.stream(container.getComponents())
            .filter(componentType::isInstance)
            .map(componentType::cast),
        Arrays.stream(container.getComponents())
            .filter(Container.class::isInstance)
            .map(Container.class::cast)
            .flatMap(c -> findComponents(c, componentType).stream())
    ).collect(Collectors.toList());
}

and it can be used like this:

// list all components:
findComponents(container, JComponent.class).stream().forEach(System.out::println);
// list components that are buttons
findComponents(container, JButton.class).stream().forEach(System.out::println);