Generate a GUID composed of username, machine name, and random int

UsernameMachinenameGUIDGenerator.java

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Map;
import java.util.Random;


public class GetMachineName {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		
		for (int i = 0; i < 10; i++) {
			String uid = getMachineAndUserIdentifer();
			System.out.println("UID:" + uid);
		}
	}

	private static String getMachineAndUserIdentifer() {
		String machineName = null;
		String userName = null;
		Integer microGUID = null;
		
		//Username
		Map<String,String> env = System.getenv();
		userName = env.get("USER");
		
		//Machine name
		try {
			machineName = InetAddress.getLocalHost().getHostName();
		} catch (UnknownHostException e) {
			throw new IllegalStateException("Hostname cannot be found, but is required.", e);
		}
		
		//GUID random number
		microGUID = new Random().nextInt();
		microGUID = Math.abs(microGUID);
		
		return userName + "@" + machineName + "@GUID" + microGUID;
	}

}