experience learned.
1. first think algorithm before concurrent
2. first solve top problem
3. memory can be problem with huge data processing
4. not to use refletion frequently
5. prefering strategy that can optimize both cpu and memory .
technical
1. thread synchronizing is how to queuing
be sure to use "while(!Thread.currentThread.isInterupted())
2. prefer high level synchronizing facility to low level methodology such as await,notify
3. dedicated sorter is much faster
西津渡