java get screen size

To get the size of the screen (display) in Java, you can use the getScreenSize method of the Toolkit class.

Here is an example of how to get the size of the primary screen:

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

The getScreenSize method returns a Dimension object representing the size of the screen, and the getWidth and getHeight methods return the width and height of the screen, respectively. These values are returned in pixels.

If you want to get the size of a specific screen, you can use the getScreenDevices method of the GraphicsEnvironment class to get an array of GraphicsDevice objects representing the available screens, and then use the getDefaultConfiguration method of the GraphicsDevice class to get the GraphicsConfiguration object for each screen. The getBounds method of the GraphicsConfiguration class returns a Rectangle object representing the bounds of the screen, which you can then use to get the width and height.

Here is an example of how to get the size of the second screen:

GraphicsDevice[] devices = GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices();
if (devices.length > 1) {
    Rectangle bounds = devices[1].getDefaultConfiguration().getBounds();
    double width = bounds.getWidth();
    double height = bounds.getHeight();
}

Note that this approach may not work on all platforms and may not be suitable for all purposes. If you need to get the size of the screen in a specific way (e.g. using a different API), you will need to use a different approach.