swing - How can I get screen resolution in java?

Question

How can one get the screen resolution (width x height) in pixels?

I am using a JFrame and the java swing methods.

Answer 1

You can get the screen size with the Toolkit.getScreenSize() method.

Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
double width = screenSize.getWidth();
double height = screenSize.getHeight();

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On a multi-monitor configuration you should use this :

GraphicsDevice gd = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice();
int width = gd.getDisplayMode().getWidth();
int height = gd.getDisplayMode().getHeight();

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If you want to get the screen resolution in DPI you'll have to use the getScreenResolution() method on Toolkit.

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Resources :

• javadoc - Toolkit.getScreenSize()
• Java bug 5100801- Toolkit.getScreenSize() does not return the correct dimension on multimon, linux