Java: How to get the size of the screen

private Dimension getScreenSize(String title)

       {

             Toolkit toolkit = getToolkit();

             Dimension screensize = toolkit.getScreenSize();

             return screensize;

       }

If this size is meant to be used for the frame that can be achieved as follows:

private void configureFrameWindow(String title)

       {

             setTitle(title);

             setDefaultLookAndFeelDecorated(true);

             Dimension screensize = getScreenSize();

             setPreferredSize(screensize);

             setMinimumSize(screensize);

ImageIcon icon = new ImageIcon(getClass().getResource("/resources/ icon.png"));

             if (icon != null) setIconImage(icon.getImage());

             setResizable(false);

       }