Rewrite the tree serialization and deserialization methods. Add applications of array and linked list.
* Anonymous inner classes create generic instances that display the declared type * Update TreeNode.java * Update binary_tree_bfs.java * Update graph_bfs.java --------- Co-authored-by: zongjianwei <zongjianwei@meituan.com> Co-authored-by: Yudong Jin <krahets@163.com>