获取随机Mac地址

//package com.nowjava;
/* from 
NowJava.com - 时  代  Java*/

import java.util.Random;


public class Main {

    public static void main(String[] argv) throws Exception {

        System.out.println(getRandomMacAddress());

    }


    public static String getRandomMacAddress() {

        String mac = "";

        Random r = new Random();

        for (int i = 0; i < 6; i++) {

            int n = r.nextInt(255);

            mac +