Caculation事件监听初步完成
Merge branch 'master' of http://github.com/suchfun/java_homework
加上RGB颜色
Merge branch 'master' of github.com:suchfun/java_homework
远程解决小问题
Merge branch 'master' of https://github.com/longzhihui/java_homework
Merge pull request #2 from suchfun/master

加上RGB颜色