遍历HashMap HashTable的最简单的方式

 Hashtable<String, String> emails = new Hashtable<String, String>();

  emails.put("1", "John");
  emails.put("2", "Smith");
  emails.put("3", "Tom");

 

for (Map.Entry<String, String> m : emails.entrySet()) {
      System.out.println("email-" + m.getKey() + ":" + m.getValue());
    }

三行代码遍历一个HashTable