java遍历map最强大的一种方式

                    Map<Job,Integer> map = new Map<Job,Integer>();

......

                  Set<Map.Entry<Job,Integer>> set = map.entrySet();

                    for (Iterator<Map.Entry<Job,Integer>> it = set.iterator(); it.hasNext();) {
                        Map.Entry<Job,Integer> entry = (Map.Entry<Job,Integer>) it.next();
                        System.out.println(entry.getKey() + "--->" + entry.getValue());
                    }