java数据结构方面的，关于二叉树，很简单、实用-data structure, for the binary tree, a very simple, practical

A Practical Introduction to Data Structures and Algorithm Analysis，数据结构和算法，里面包括Java描述、C++描述和C描述三个版本，非常全-A Practical Introduction to Data Structures and Analysis Algorithm, data structures and algorithms, including Java inside descr iption, descr ipti

Java实现K-means算法，很好，很实用的-Java implementation of the K-means algorithm, very good, very practical