控制界面控件的遍历顺序

1，给默认的tab键遍历控件，添加别的按键的

    private void registerKeyTravel() {
        //回车键顺序遍历
        KeyStroke enterKS = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0);
        Set<AWTKeyStroke> ksSet = new HashSet<AWTKeyStroke>();
        Set<AWTKeyStroke> set = getFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS);
        ksSet.addAll(set);
        ksSet.add(enterKS);
        setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
                ksSet);
　　　　　//shift 回车反向遍历
        KeyStroke sEnterKS = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER,
                InputEvent.SHIFT_MASK);
        Set<AWTKeyStroke> sKsSet = new HashSet<AWTKeyStroke>();
        Set<AWTKeyStroke> sSet = getFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS);
        sKsSet.addAll(sSet);
        sKsSet.add(sEnterKS);
        setFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS,
                sKsSet);
    }

2，FocusTraversalPolicy能够提供焦点跟细致的控制