Obtaining Screen Resolution in Java

Introduction

Retrieving the screen resolution in Java is a crucial task for various applications, ranging from window management to image processing. When working with Java Swing and JFrame, this information becomes essential. Let's delve into the available methods to achieve this goal.

Toolkit.getScreenSize()

The Toolkit class provides the getScreenSize() method, which returns the Dimension object representing the screen size. This approach works well on single-display systems. Here's an example:

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

GraphicsDevice.getDisplayMode()

In multi-monitor configurations, you might need to use the GraphicsDevice class. The getDisplayMode() method of this class returns the DisplayMode object, which holds information about the current display mode, including its width and height.

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

Toolkit.getScreenResolution()

If you're interested in the screen resolution in DPI (dots per inch), the getScreenResolution() method of the Toolkit class is the way to go. It takes an array of two integers as a parameter, which will be filled with the horizontal and vertical DPI values.

int[] screenResolution = Toolkit.getDefaultToolkit().getScreenResolution();
int dpiX = screenResolution[0];
int dpiY = screenResolution[1];

Conclusion

By utilizing these methods, you can effectively retrieve the screen resolution in Java. Whether you're working with a single display or a multi-monitor setup, these solutions will provide you with the necessary information for your applications.

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