How to Determine Screen Resolution in Java?

Determining Screen Resolution in Java

Acquiring the screen resolution, expressed as pixel width and height, can be a valuable operation for various applications. In Java, obtaining this information is achievable through the utilization of specific methods.

Using JFrame and Swing Methods

To retrieve the screen size within a JFrame application using Java Swing methods, employ the following approach:

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

Multi-Monitor Configurations

In multi-monitor environments, where multiple screens are connected to a single system, you may need to use an alternative approach:

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

DPI-Based Screen Resolution

To obtain the screen resolution in dots per inch (DPI), a different method is available:

 Toolkit.getDefaultToolkit().getScreenResolution();

Additional Resources

For further information, refer to the following resources:

• [Javadoc - Toolkit.getScreenSize()](https://docs.oracle.com/javase/9/docs/api/java/awt/Toolkit.html#getScreenSize--)
• [Java bug 5100801- Toolkit.getScreenSize() does not return the correct dimension on multimon, linux](https://bugs.java.com/bugdatabase/view_bug.do?bug_id=5100801)

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