请问swing高手JFrame的字体问题？

Question

System.setProperty("swing.plaf.metal.controlFont","宋体");

Answer 1

Font font=new Font("宋体",Font.PLAIN,13);
UIManager.put("Button.font",font);
try
    {
    UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
    //SwingUtilities.updateComponentTreeUI(this);
//System.out.println("the fonts has seted");
    }
    catch(Exception e) {
       e.printStackTrace();
    }