Peter, thank you for your comments. A cruel fact is that most of us Chinese guys can only make our living by coding. So I posted some small tricks for people who are new in Java.
In the real life, I think coding is essential to us. One of my friend's wife just lost her job because her poor coding ability jeopardized the whole project.
We would be greatly appreciated if you could post something about architecture. Thank you in advance. --Jabber