当我有一台只有 DVI 输出和显示器是 VGA 输入的 PC 时(所以我使用了一个小型 DVI 到 VGA 转换器,我有我的操作系统显示器)
Linux 显示查询显示如下:
$ export DISPLAY=:0.0 && xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1280 x 1024, maximum 1280 x 1024
default connected 1280x1024+0+0 0mm x 0mm
1280x1024 0.0*
1024x768 0.0
800x600 0.0
640x480 0.0
legend (0x10c) 74.5MHz
h: width 1280 start 1344 end 1472 total 1664 skew 0 clock 44.8KHz
v: height 720 start 723 end 728 total 748 clock 59.9Hz
- 我的 Java 应用程序在启动时感到困惑,并且无法启动应用程序,但异常来自dm.getWidth();
:
screen = Toolkit.getDefaultToolkit().getScreenSize();
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice[] screenDevices = ge.getScreenDevices();
for (int i = 0; i < screenDevices.length; i++) {
System.out.println(screenDevices[i].getIDstring());
DisplayMode dm = screenDevices[i].getDisplayMode();
int screenWidth = dm.getWidth(); // this fails....
int screenHeight = dm.getHeight();
System.out.println("[myResolution]: " + screenWidth + " " + screenHeight);
screen.width = screenWidth;
screen.height = screenHeight;
}
--输出:
[meJavaDebug]: YES i am running
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at main.YumYumYum.createAndShowGUI(YumYumYum.java:167)
at main.YumYumYum.access$000(YumYumYum.java:42)
at main.YumYumYum$1.run(YumYumYum.java:118)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:226)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:647)
at java.awt.EventQueue.access$000(EventQueue.java:96)
at java.awt.EventQueue$1.run(EventQueue.java:608)
at java.awt.EventQueue$1.run(EventQueue.java:606)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:105)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:617)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)
Total Garbage Collections: 0
Total Garbage Collection Time (ms): 0
任何的想法?