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

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Here s some functional code  Java 8  which returns the x position of the right most edge of the right most screen   If no screens are found  then it returns 0     GraphicsDevice devices       devices   GraphicsEnvironment       getLocalGraphicsEnvironment         getScreenDevices       return Stream       of devices        map GraphicsDevice  getDefaultConfiguration        map GraphicsConfiguration  getBounds        mapToInt bounds - gt  bounds x   bounds width        max         orElse 0     Here are links to the JavaDoc   GraphicsEnvironment getLocalGraphicsEnvironment   GraphicsEnvironment getScreenDevices   GraphicsDevice getDefaultConfiguration   GraphicsConfiguration getBounds

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These three functions return the screen size in Java  This code accounts for multi-monitor setups and task bars  The included functions are  getScreenInsets    getScreenWorkingArea    and getScreenTotalArea     Code          getScreenInsets  This returns the insets of the screen  which are defined by any task bars    that have been set up by the user  This function accounts for multi-monitor setups  If a    window is supplied  then the the monitor that contains the window will be used  If a window    is not supplied  then the primary monitor will be used      static public Insets getScreenInsets Window windowOrNull        Insets insets      if  windowOrNull    null            insets   Toolkit getDefaultToolkit   getScreenInsets GraphicsEnvironment                  getLocalGraphicsEnvironment   getDefaultScreenDevice                    getDefaultConfiguration           else           insets   windowOrNull getToolkit   getScreenInsets                  windowOrNull getGraphicsConfiguration               return insets            getScreenWorkingArea  This returns the working area of the screen   The working area excludes    any task bars   This function accounts for multi-monitor setups  If a window is supplied     then the the monitor that contains the window will be used  If a window is not supplied  then    the primary monitor will be used      static public Rectangle getScreenWorkingArea Window windowOrNull        Insets insets      Rectangle bounds      if  windowOrNull    null            GraphicsEnvironment ge   GraphicsEnvironment getLocalGraphicsEnvironment            insets   Toolkit getDefaultToolkit   getScreenInsets ge getDefaultScreenDevice                    getDefaultConfiguration             bounds   ge getDefaultScreenDevice   getDefaultConfiguration   getBounds          else           GraphicsConfiguration gc   windowOrNull getGraphicsConfiguration            insets   windowOrNull getToolkit   getScreenInsets gc           bounds   gc getBounds              bounds x    insets left      bounds y    insets top      bounds width -   insets left   insets right       bounds height -   insets top   insets bottom       return bounds            getScreenTotalArea  This returns the total area of the screen   The total area includes any    task bars   This function accounts for multi-monitor setups  If a window is supplied  then    the the monitor that contains the window will be used  If a window is not supplied  then the    primary monitor will be used      static public Rectangle getScreenTotalArea Window windowOrNull        Rectangle bounds      if  windowOrNull    null            GraphicsEnvironment ge   GraphicsEnvironment getLocalGraphicsEnvironment            bounds   ge getDefaultScreenDevice   getDefaultConfiguration   getBounds          else           GraphicsConfiguration gc   windowOrNull getGraphicsConfiguration            bounds   gc getBounds              return bounds

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int resolution  Toolkit getDefaultToolkit   getScreenResolution     System out println resolution

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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

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Here is a snippet of code I often use  It returns the full available screen area  even on multi-monitor setups  while retaining the native monitor positions    public static Rectangle getMaximumScreenBounds         int minx 0  miny 0  maxx 0  maxy 0      GraphicsEnvironment environment   GraphicsEnvironment getLocalGraphicsEnvironment        for GraphicsDevice device   environment getScreenDevices             Rectangle bounds   device getDefaultConfiguration   getBounds            minx   Math min minx  bounds x           miny   Math min miny  bounds y           maxx   Math max maxx   bounds x bounds width           maxy   Math max maxy  bounds y bounds height             return new Rectangle minx  miny  maxx-minx  maxy-miny       On a computer with two full-HD monitors  where the left one is set as the main monitor  in Windows settings   the function returns  java awt Rectangle x 0 y 0 width 3840 height 1080    On the same setup  but with the right monitor set as the main monitor  the function returns  java awt Rectangle x -1920 y 0 width 3840 height 1080

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int screenResolution   Toolkit getDefaultToolkit   getScreenResolution    System out println    screenResolution

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This is the resolution of the screen that the given component is currently assigned  something like most part of the root window is visible on that screen    public Rectangle getCurrentScreenBounds Component component        return component getGraphicsConfiguration   getBounds        Usage   Rectangle currentScreen   getCurrentScreenBounds frameOrWhateverComponent   int currentScreenWidth   currentScreen width    current screen width int currentScreenHeight   currentScreen height    current screen height    absolute coordinate of current screen  gt  0 if left of this screen are further screens int xOfCurrentScreen   currentScreen x   If you want to respect toolbars  etc  you ll need to calculate with this  too   GraphicsConfiguration gc   component getGraphicsConfiguration    Insets screenInsets   Toolkit getDefaultToolkit   getScreenInsets gc

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This call will give you the information you want   Dimension screenSize   Toolkit getDefaultToolkit   getScreenSize

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This code will enumerate the graphics devices on the system  if multiple monitors are installed   and you can use that information to determine monitor affinity or automatic placement  some systems use a little side monitor for real-time displays while an app is running in the background  and such a monitor can be identified by size  screen colors  etc        Test if each monitor will support my app s window    Iterate through each monitor and see what size each is GraphicsEnvironment ge        GraphicsEnvironment getLocalGraphicsEnvironment    GraphicsDevice      gs        ge getScreenDevices    Dimension           mySize    new Dimension myWidth  myHeight   Dimension           maxSize   new Dimension minRequiredWidth  minRequiredHeight   for  int i   0  i  lt  gs length  i          DisplayMode dm   gs i  getDisplayMode        if  dm getWidth    gt  maxSize getWidth    amp  amp  dm getHeight    gt  maxSize getHeight               Update the max size found on this monitor         maxSize setSize dm getWidth    dm getHeight                   Do test if it will work here

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Dimension screenSize   Toolkit getDefaultToolkit   getScreenSize    double width   screenSize getWidth    double height   screenSize getHeight    framemain setSize  int width  int height   framemain setResizable true   framemain setExtendedState JFrame MAXIMIZED BOTH

[java] How can I get screen resolution in java?

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