java change swing look and feel to system ui

1public static void main(String[] args) {
2    try {
3            // Set System L&F
4        UIManager.setLookAndFeel(
5            UIManager.getSystemLookAndFeelClassName());
6    } 
7    catch (UnsupportedLookAndFeelException e) {
8       // handle exception
9    }
10    catch (ClassNotFoundException e) {
11       // handle exception
12    }
13    catch (InstantiationException e) {
14       // handle exception
15    }
16    catch (IllegalAccessException e) {
17       // handle exception
18    }
19
20    new SwingApplication(); //Create and show the GUI.
21}
22