java - 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.

for (Component c : panCrawling.getComponents()) {
    //processing
}
for (Component c : panFile.getComponents()) {
    //processing
}
for (Component c : panThread.getComponents()) {
    //processing
}
for (Component c : panLog.getComponents()) {
    //processing
}
//continue to all panels

I want to do something like this and get all the elements without need specefy all the panels names. How I do this. The code below don't get all the elements.

for (Component c : this.getComponents()) {
    //processing
}

Answer 1

You can write a recursive method and recurse on every container:

This site provides some sample code:

public static List<Component> getAllComponents(final Container c) {
    Component[] comps = c.getComponents();
    List<Component> compList = new ArrayList<Component>();
    for (Component comp : comps) {
        compList.add(comp);
        if (comp instanceof Container)
            compList.addAll(getAllComponents((Container) comp));
    }
    return compList;
}

If you only want the components of the immediate sub-components, you could limit the recursion depth to 2.