How to create a "virtual device environment" in Java to work with multiple monitors?

The method getScreenDevices() of Graphic开发者_如何学JAVAsEnvironment must return a list of GraphicsDevice in my system. How can I configure my system to work with these GraphicsDevice, beforehand?

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As long as you have the monitors hooked up and enabled in the operating system, Java will detect them. Consider this code:

GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice[] devices = env.getScreenDevices();
Rectangle[] screenBounds = new Rectangle[devices.length];
for (int x = 0; x < this.devices.length; x++) {
  GraphicsConfiguration conf = this.devices[x].getDefaultConfiguration();
  screenBounds[x] = conf.getBounds();
}

You can also investigate Toolkit.getDefaultToolkit().getScreenInsets(configuration) to get a list of insets so you know, for example, where the start bar is.

Be warned, however, that if you try to do this under certain X windows environments, the insets are not available. I worked around this problem by creating an invisible frame on each screen, maximizing them, waiting for them to generate a resize event, and then grabbing their bounds and disposing of them. But I only trigger this code if I get zero insets from all the monitors.

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If I understand well your question, and you want to create a "virtual device" here is an answer :

As the GraphicsEnvironment uses system properties to access the available devices, you would have to modify your JVM or trick the system to make it thinks it has another device.