import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
public class Main {
public static void main(String[] argv) throws Exception {
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
try {
GraphicsDevice[] gs = ge.getScreenDevices();
int numScreens = gs.length;
} catch (HeadlessException e) {
}
}
}