public static void main()

in src/main/java/org/apache/log4j/chainsaw/LogUI.java [206:243]
33 lines of code
10 McCabe index (conditional complexity)

    public static void main(String[] args) {
        if (args.length > 0) {
            configurationURLAppArg = args[0];
        }

        if (OSXIntegration.IS_OSX) {
            System.setProperty("apple.laf.useScreenMenuBar", "true");
        }

        AbstractConfiguration configuration = SettingsManager.getInstance().getGlobalConfiguration();

        EventQueue.invokeLater(() -> {
            String lookAndFeelClassName = configuration.getString("lookAndFeelClassName");
            if (lookAndFeelClassName == null || lookAndFeelClassName.trim().equals("")) {
                String osName = System.getProperty("os.name");
                if (osName.toLowerCase(Locale.ENGLISH).startsWith("mac")) {
                    //no need to assign look and feel
                } else if (osName.toLowerCase(Locale.ENGLISH).startsWith("windows")) {
                    lookAndFeelClassName = "com.sun.java.swing.plaf.windows.WindowsLookAndFeel";
                    configuration.setProperty("lookAndFeelClassName",lookAndFeelClassName);
                } else if (osName.toLowerCase(Locale.ENGLISH).startsWith("linux")) {
                    lookAndFeelClassName = "com.sun.java.swing.plaf.gtk.GTKLookAndFeel";
                    configuration.setProperty("lookAndFeelClassName",lookAndFeelClassName);
                }
            }

            if (lookAndFeelClassName != null && !(lookAndFeelClassName.trim().equals(""))) {
                try{
                    UIManager.setLookAndFeel(lookAndFeelClassName);
                }catch(Exception ex){}
            }else{
                try{
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                }catch(Exception ex){}
            }
            createChainsawGUI(null);
        });
    }