20种软件设计模式之observer，可以教你了解java设计模式更好编程 -20 kinds of software design patterns observer, can teach you to understand java design patterns better programming

This danish notes to a course about Java programming. Involves design patterns, like the proxy pattern, observer etc. Details about: generic classes Annonym classes Enums Singleton JDBC (pros/cons) Inheritances and so on-This

Observer java code : difference between push and pull style of observer