JFrame.setDefaultLookAndFeelDecorated(true);
JDialog.setDefaultLookAndFeelDecorated(true);
try  {
            SubstanceImageWatermark watermark  =   new  SubstanceImageWatermark(LoginFrame. class .getResourceAsStream( " /demo/001.jpg " ));
            watermark.setKind(ImageWatermarkKind.SCREEN_CENTER_SCALE);
            SubstanceSkin skin  =   new  OfficeBlue2007Skin().withWatermark(watermark);   //初始化有水印的皮肤

            UIManager.setLookAndFeel( new  SubstanceOfficeBlue2007LookAndFeel());
            SubstanceLookAndFeel.setSkin(skin);  //设置皮肤
           
        }  catch  (UnsupportedLookAndFeelException ex) {
            Logger.getLogger(LoginFrame. class .getName()).log(Level.SEVERE,  null , ex);
        }


我这样设置了，但没效果,什么原因？

JFrame.setDefaultLookAndFeelDecorated(true);
JDialog.setDefaultLookAndFeelDecorated(true);
try  {
            SubstanceImageWatermark watermark  =   new  SubstanceImageWatermark(LoginFrame. class .getResourceAsStream( " /demo/001.jpg " ));
            watermark.setKind(ImageWatermarkKind.SCREEN_CENTER_SCALE);
            SubstanceSkin skin  =   new  OfficeBlue2007Skin().withWatermark(watermark);   //初始化有水印的皮肤

            UIManager.setLookAndFeel( new  SubstanceOfficeBlue2007LookAndFeel());
            SubstanceLookAndFeel.setSkin(skin);  //设置皮肤
           
        }  catch  (UnsupportedLookAndFeelException ex) {
            Logger.getLogger(LoginFrame. class .getName()).log(Level.SEVERE,  null , ex);
        }


我这样设置了，但没效果,什么原因？