Design patterns in software development

Design pattern describes a repeatedly presenting issue during software designing, as well the solution to it. Applying design pattern enables developers to reuse it to solve a specified designing issue. Design patterns help designers communicate architectural knowledge, help people learn a new design paradigm, and help new developers avoid traps and pitfalls that have traditionally been learned only by costly experiences. In this paper, we briefly introduce the concept of software design pattern and give a research on some design patterns, including Observer Pattern, Decorator Pattern, Factory Method Pattern and Abstract Factory Pattern.