You can get the screen size with the Toolkit.getScreenSize() method.
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
double width = screenSize.getWidth();
double height = screenSize.getHeight();
On a multi-monitor configuration you should use this :
GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
int width = gd.getDisplayMode().getWidth();
int height = gd.getDisplayMode().getHeight();
If you want to get the screen resolution in DPI you’ll have to use the getScreenResolution() method on Toolkit.
Resources :
- javadoc – Toolkit.getScreenSize()
- Java bug 5100801- Toolkit.getScreenSize() does not return the correct dimension on multimon, linux