designPatterns

Source for design pattern examples with Java

design principles

Identify the aspects of your application that vary and separate them from what stays the same
Program to an interface not an implementation
Favor composition over inheritance
Strive for loosely coupled designs between objects that interact
Classes should be open for extension, but closed for modification
Depend upon abstractions. Do not depend upon concrete classes
Talk only to your friends (Principle of Least Knowledge).
Don't call us, we call you.