Swing JTabbedPane忽略LookAndFeel

Question

我设置了LookAndFeel：

try {
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    } catch (ClassNotFoundException | InstantiationException | IllegalAccessException
        | UnsupportedLookAndFeelException e) {
        e.printStackTrace();
    }

然后我创建了一个JTabbedPane，但它仍然没有改变：