Swing中按Tab键使控件按照一定的顺序被选中

focusOrderList = new ArrayList<Component>();
            focusOrderList.add(muteRadio);
            focusOrderList.add(defaultRadio);
            focusOrderList.add(manualRadio);
            focusOrderList.add(fileTxtField);
            focusOrderList.add(selectBtn);
            focusOrderList.add(playBackBtn);
            focusOrderList.add(okBtn);
            focusOrderList.add(cancelBtn);
            focusPolicy = new MyOwnFocusTraversalPolicy();
            //FoucusPolicyの設定
            this.setFocusTraversalPolicy(focusPolicy);

/**
     * FocusTraversalPolicy
     *
     */
    public class MyOwnFocusTraversalPolicy extends FocusTraversalPolicy {
        /**
         *
         * @param focusCycleRoot Container
         * @param aComponent Component
         * @return Component
         */
        public Component getComponentAfter(Container focusCycleRoot,
                                           Component aComponent) {

            int nIDx = focusOrderList.indexOf(aComponent);

            int nAfter;
            if (nIDx == focusOrderList.size() - 1) {
                nAfter = 0;
            } else {
                nAfter = nIDx + 1;
            }

            Component component = focusOrderList.get(nAfter);

            boolean bContinue = false;

            if (!component.isEnabled()) {
                bContinue = true;
            } else if (component instanceof JTextField) {
                JTextField txtField = (JTextField) component;
                if (!txtField.isEditable()) {
                    bContinue = true;
                }
            }

            if (bContinue) {
                return getComponentAfter(focusCycleRoot, component);
            } else {
                return component;
            }
        }
        /**
         *
         * @param focusCycleRoot Container
         * @param aComponent Component
         * @return Component
         */
        public Component getComponentBefore(Container focusCycleRoot,
                                            Component aComponent) {

            int nIDx = focusOrderList.indexOf(aComponent);

            int nBefore;
            if (nIDx == 0) {
                nBefore = focusOrderList.size() - 1;
            } else {
                nBefore = nIDx - 1;
            }

            Component component = focusOrderList.get(nBefore);

            boolean bContinue = false;

            if (!component.isEnabled()) {
                bContinue = true;
            } else if (component instanceof JTextField) {
                JTextField txtField = (JTextField) component;
                if (!txtField.isEditable()) {
                    bContinue = true;
                }
            }

            if (bContinue) {
                return getComponentBefore(focusCycleRoot, component);
            } else {
                return component;
            }

        }
        /**
         *
         * @param focusCycleRoot Container
         * @return Component
         */
        public Component getDefaultComponent(Container focusCycleRoot) {
            Component component = focusOrderList.get(0);
            return component;
        }
        /**
         *
         * @param focusCycleRoot Container
         * @return Component
         */
        public Component getLastComponent(Container focusCycleRoot) {
            Component component = focusOrderList.get(focusOrderList.size() - 1);
            return component;
        }
        /**
         *
         * @param focusCycleRoot Container
         * @return Component
         */
        public Component getFirstComponent(Container focusCycleRoot) {
            Component component = focusOrderList.get(0);
            return component;
        }
    }