说明：  这套面试题主要目的是帮助那些还没有java软件开发实际工作经验，而正在努力寻找java软件开发工作的朋友在笔试时更好地赢得笔试和面试。
(The main purpose of interview questions is to help those who have not java software development work experience, and are trying to find java software development work better when a friend won the written test and interview.)