http://www.cnblogs.com/xdp-gacl/category/563690.html
http://www.cnblogs.com/vincent-blog/p/4402327.html
day1:java IO流：http://www.cnblogs.com/xdp-gacl/p/3634409.html
Java API：http://dlc-cdn.sun.com/jdk/jdk-api-localizations/jdk-api-zh-cn/publish/1.6.0/html/zh_CN/api/java/io/package-tree.html，http://www.programcreek.com/java-api-examples/index.php?action=index
leetcode的分类总结，非常好：http://www.programcreek.com/2012/11/top-10-algorithms-for-coding-interview/