Find out a monitor’s size / resolution in Eclipse SWT

For Single Monitor :

      @Inject
      @Optional
      public void receiveActiveShell(@Named(IServiceConstants.ACTIVE_SHELL) final Shell shell) {
           if (shell != null) {
                final Display display = shell.getDisplay();
                final Rectangle screenSize = display.getBounds();
                final Point size = shell.getSize();
                shell.setLocation((int) (screenSize.width - size.x) / 2, (int) (screenSize.height - size.y) / 2);
           }
      }

For Multi Monitor :

 Monitor[] monitors = getShell().getDisplay().getMonitors();  
 Monitor activeMonitor = null;  
 Rectangle rect = shell.getBounds();  
 for (int i = 0; i < monitors.length; i++) {  
   if (monitors[i].getBounds().intersects(rect)) {  
     activeMonitor = monitors[i];  
   }  
 }  
 System.out.println("The resolution of the active monitor is " +   
   activeMonitor.getBounds().width + " x " +   
   activeMonitor.getBounds().height);