Basic data structure practice for Java beginners: doubly linked list
请补全Main中的方法，创建一个双向链表。在提交Pull Request之前，你应当在本地确保所有代码已经编译通过，并且通过了测试(mvn clean verify)
注意！我们只允许你修改以下文件，对其他文件的修改会被拒绝：
敬请期待写代码啦的课程
敬请期待
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