问题：
If I have an object implementing the Map interface in Java and I wish to iterate over every pair contained within it, what is the most efficient way of going through the map? 如果我有一个用Java实现Map接口的对象，并且希望对其中包含的每一对进行迭代，那么遍历该映射的最有效方法是什么？
Will the ordering of elements depend on the specific map implementation that I have for the interface? 元素的顺序是否取决于我对接口的特定映射实现？
解决方案：
参考一： https://stackoom.com/question/CCQ/如何有效地遍历Java-Map中的每个条目参考二： https://oldbug.net/q/CCQ/How-do-I-efficiently-iterate-over-each-entry-in-a-Java-Map
来源：oschina
链接：https://my.oschina.net/u/4438370/blog/4457963