laguage comparison
C# Programming Fundamentals: The C# Type System
http://zone.ni.com/devzone/cda/ph/p/id/4#toc0
c++0x
http://en.wikipedia.org/wiki/C%2B%2B0x
Comparison of Java and C++
http://en.wikipedia.org/wiki/Comparison_of_Java_and_C%2B%2B
Comparison of Java and C Sharp
http://en.wikipedia.org/wiki/Comparison_of_Java_and_C_Sharp
sealed关键字，中文意思是密封，故名思义，就是由它修饰的类或方法将不能被继承或是重写
The wxWidgets programming tutorial
http://zetcode.com/tutorials/wxwidgetstutorial/