183     /**
 184      * This should only be called from the static initializer, so no need for
 185      * the synchronized keyword.
 186      */
 187     private static native void initDisplay(boolean glxRequested);
 188 
 189     public X11GraphicsEnvironment() {
 190     }
 191 
 192     protected native int getNumScreens();
 193 
 194     protected GraphicsDevice makeScreenDevice(int screennum) {
 195         return new X11GraphicsDevice(screennum);
 196     }
 197 
 198     protected native int getDefaultScreenNum();
 199     /**
 200      * Returns the default screen graphics device.
 201      */
 202     public GraphicsDevice getDefaultScreenDevice() {
 203         return getScreenDevices()[getDefaultScreenNum()];





 204     }
 205 
 206     public boolean isDisplayLocal() {
 207         if (isDisplayLocal == null) {
 208             SunToolkit.awtLock();
 209             try {
 210                 if (isDisplayLocal == null) {
 211                     isDisplayLocal = Boolean.valueOf(_isDisplayLocal());
 212                 }
 213             } finally {
 214                 SunToolkit.awtUnlock();
 215             }
 216         }
 217         return isDisplayLocal.booleanValue();
 218     }
 219 
 220     private static boolean _isDisplayLocal() {
 221         if (isHeadless()) {
 222             return true;
 223         }

 183     /**
 184      * This should only be called from the static initializer, so no need for
 185      * the synchronized keyword.
 186      */
 187     private static native void initDisplay(boolean glxRequested);
 188 
 189     public X11GraphicsEnvironment() {
 190     }
 191 
 192     protected native int getNumScreens();
 193 
 194     protected GraphicsDevice makeScreenDevice(int screennum) {
 195         return new X11GraphicsDevice(screennum);
 196     }
 197 
 198     protected native int getDefaultScreenNum();
 199     /**
 200      * Returns the default screen graphics device.
 201      */
 202     public GraphicsDevice getDefaultScreenDevice() {
 203         GraphicsDevice[] screens = getScreenDevices();
 204         if (screens.length == 0) {
 205             return null;
 206         }
 207         int index = getDefaultScreenNum();
 208         return screens[0 < index && index < screens.length ? index : 0];
 209     }
 210 
 211     public boolean isDisplayLocal() {
 212         if (isDisplayLocal == null) {
 213             SunToolkit.awtLock();
 214             try {
 215                 if (isDisplayLocal == null) {
 216                     isDisplayLocal = Boolean.valueOf(_isDisplayLocal());
 217                 }
 218             } finally {
 219                 SunToolkit.awtUnlock();
 220             }
 221         }
 222         return isDisplayLocal.booleanValue();
 223     }
 224 
 225     private static boolean _isDisplayLocal() {
 226         if (isHeadless()) {
 227             return true;
 228         }