java.awt.Window是所有顶级窗口(Frame,JFrame,Dialog等)的基类,它包含返回窗口正在使用的 @L_403_2@的getGraphicsConfiguration()方法. GraphicsConfiguration具有getGraphicsDevice()方法,它返回GraphicsConfiguration所属的 GraphicsDevice.然后,您可以使用 GraphicsEnvironment类来对系统中的所有GraphicsDevices进行测试,并查看该窗口属于哪一个.

Window myWindow = ....
// ...
GraphicsConfiguration config = myWindow.getGraphicsConfiguration();
GraphicsDevice myScreen = config.getDevice();
GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
// AFAIK - there are no guarantees that screen devices are in order... 
// but they have been on every system I've used.
GraphicsDevice[] allScreens = env.getScreenDevices();
int myScreenIndex = -1;
for (int i = 0; i < allScreens.length; i++) {
    if (allScreens[i].equals(myScreen))
    {
        myScreenIndex = i;
        break;
    }
}
System.out.println("window is on screen" + myScreenIndex);