blogs for learning java

曹海成的专栏

http://blog.csdn.net/caohaicheng/article/details/38071097

http://blog.csdn.net/a5489888/article/details/8278301

http://blog.csdn.net/fmh2011/article/details/39205759

http://blog.csdn.net/caohaicheng/article/details/38116481

java nio

http://blog.csdn.net/sgbfblog/article/details/7905401