How do you get the screen width in java?

Does anyone know how you would get the screen width in java? I read something about some toolk开发者_Go百科it method but I'm not quite sure what that is.

Thanks, Andrew

java.awt.Toolkit.getDefaultToolkit().getScreenSize()

Here are the two methods I use, which account for multiple monitors and task-bar insets. If you don't need the two methods separately, you can, of course, avoid getting the graphics config twice.

static public Rectangle getScreenBounds(Window wnd) {
    Rectangle                           sb;
    Insets                              si=getScreenInsets(wnd);

    if(wnd==null) { 
        sb=GraphicsEnvironment
           .getLocalGraphicsEnvironment()
           .getDefaultScreenDevice()
           .getDefaultConfiguration()
           .getBounds(); 
        }
    else { 
        sb=wnd
           .getGraphicsConfiguration()
           .getBounds(); 
        }

    sb.x     +=si.left;
    sb.y     +=si.top;
    sb.width -=si.left+si.right;
    sb.height-=si.top+si.bottom;
    return sb;
    }

static public Insets getScreenInsets(Window wnd) {
    Insets                              si;

    if(wnd==null) { 
        si=Toolkit.getDefaultToolkit().getScreenInsets(GraphicsEnvironment
           .getLocalGraphicsEnvironment()
           .getDefaultScreenDevice()
           .getDefaultConfiguration()); 
        }
    else { 
        si=wnd.getToolkit().getScreenInsets(wnd.getGraphicsConfiguration()); 
        }
    return si;
    }

The working area is the desktop area of the display, excluding taskbars, docked windows, and docked tool bars.

If what you want is the "working area" of the screen, use this:

public static int GetScreenWorkingWidth() {
    return java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().width;
}

public static int GetScreenWorkingHeight() {
    return java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().height;
}

Toolkit has a number of classes that would help:

1. getScreenSize - raw screen size
2. getScreenInsets - gets size of toolbar, dock
3. getScreenResolution - dpi

We end up using 1 and 2, to compute usable maximum window size. To get the relevant GraphicsConfiguration, we use

GraphicsEnvironment.getLocalGraphicsEnvironment().getScreenDevices()[0].getDefaultConfiguration();

but there may be smarter multiple-monitor solutions.

The following code should do it (haven't tried it):

GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice gd = ge.getDefaultScreenDevice();
gd.getDefaultConfiguration().getBounds().getWidth();

edit:

For multiple monitors you should use the following code (taken from the javadoc of java.awt.GraphicsConfiguration:

  Rectangle virtualBounds = new Rectangle();
  GraphicsEnvironment ge = GraphicsEnvironment.
          getLocalGraphicsEnvironment();
  GraphicsDevice[] gs =
          ge.getScreenDevices();
  for (int j = 0; j < gs.length; j++) { 
      GraphicsDevice gd = gs[j];
      GraphicsConfiguration[] gc =
          gd.getConfigurations();
      for (int i=0; i < gc.length; i++) {
          virtualBounds =
              virtualBounds.union(gc[i].getBounds());
      }
  } 

The OP probably wanted something like this:

Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();

Toolkit.getDefaultToolkit().getScreenSize().getWidth()

You can get it by using the AWT Toolkit.

Toolkit.getScreenSize().

Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

If you need the resolution of the screen that a certain component is currently assigned to (something like most part of the root window is visible on that screen), you can use this answer.

A good way of detecting whether or not something is within visual bounds, is using

Screen.getScreensForRectangle(x, y, width, height).isEmpty();

This is an improvement to the multi-monitor solution posted (above) by Lawrence Dol. As in his solution, this code accounts for multiple monitors and task-bar insets. The included functions are: getScreenInsets(), getScreenWorkingArea(), and getScreenTotalArea().

Changes from the Lawrence Dol version:

• This avoids getting the graphics configuration twice.
• Added a function for getting the total screen area.
• Renamed the variables for clarity.
• Added Javadocs.

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;
}