import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
public class MainClass {
public static void main(String[] a) throws Exception {
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
GraphicsDevice[] screenDevices = ge.getScreenDevices();
for (int i = 0; i < screenDevices.length; i++)
System.out.println(screenDevices[i].getIDstring());
}
}