import java.io.IOException;

class ShutDownManager
{
	public static void shutDownSystem()
	{
		String property = System.getProperty("os.name" );
		System.out.println( property );

		if ( property.toLowerCase().contains("windows") )
		{
			String[] commands = { "shutdown", "-s" };

			try {
//do something before shutdown..
				Process process = Runtime.getRuntime().exec( commands );
			}
			catch (IOException e)
			{
				e.printStackTrace();
			}
		}

		if ( property.toLowerCase().contains("linux") )
		{
			String[] commands = { "shutdown", "-p", "now" };

			try {
//do something before shutdown..
				Process process = Runtime.getRuntime().exec( commands );
				//process.waitFor();
			}
			catch (IOException e)
			{
				e.printStackTrace();
			}
		}
	}
}


public class Main
{
	public static void main( String[] args )
	{
		new ShutDownManager().shutDownSystem();
	}
}