[java] Swing Component Hierarchy

public class MyClass {        private static ArrayList<JRadioButton> myRadioButtons;    public static final int RBUTTONS = 3;        public static void main(String[] args) {        myRadioButtons = createAndShowGUI(true);                // Now we have an ArrayList (called myRadioButtons) that contains references to your        // radiobuttons as an instance variable of MyClass!        // this means that all the methods in MyClass can easily        // muck around with those radioButtons.        // here is an example of gaining access to those radiobuttons        // and doing something useful with them        int i = 1;        for(RadioButton rButton : myRadioButtons) {            if(rButton.isSelected())                System.out.printf("Radio button %d selected!%n", i);            i++;        }    }        private static ArrayList<JRadioButton> createAndShowGUI(boolean isWeld) {        // first we set up the GUI like normal        JFrame frame = new JFrame("GUI Program");        // etc...                // set up a collection so that we can return references to the        // JRadioButton objects to the caller        ArrayList<JRadioButton> a = new ArrayList<JRadioButton>();        for(int i = 0; i < RBUTTONS; i++) {            JRadioButton rButton = new JRadioButton();            component.add(rButton); // don't forget to add the buttons to the GUI            a.add(rButton); // add the buttons to our collection        }        return a;    }}