707代码规范化，添加部分comments; 203添加了java版本的递归 #2818
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donghuanjie
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donghuanjie
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将外置的ListNode class统一放进MyLinkedList class内部，对外部不可见的封装ListNode class更规范；
format了单向和双向链表两版code的ListNode的名称，统一使用3个字母，和本身构造类中的4个字母错开，更清晰易懂；
统一了size++和size--在方法的末尾而不是中间，更规范，并且方便后期debug；
统一了index判断语句，修改了部分格式没有空格等不规范问题；
修改和添加了部分comment，主要的comment和算法结构都没有修改；
两版code都已通过leetcode test，请放心食用