【Java】整理树的几种遍历方式总结

http://www.cnblogs.com/developerY/p/3323264.html BFS和DFS详解以及java实现

http://sunlujing.iteye.com/blog/1876540

http://www.cnblogs.com/dolphin0520/archive/2011/07/13/2105236.html

http://blog.csdn.net/eric_zl_zhang/article/details/7660187

http://blog.csdn.net/my_jobs/article/details/43451187 二叉树遍历（前序、中序、后序、层次遍历、深度优先、广度优先）