Design Pattern Learning

Recently began to learn design patterns, mainly using the

But the book also has shortcomings, such as the publication time of 07, long time, the JDK version has been a lot newer, but the version used in the book is still the old version, some of the usage has changed, such as the obvious generics.

I put the book on the concept of things in order to facilitate their learning to consolidate.

Policy mode: Define the algorithm family, respectively encapsulated, so that they can replace each other, this mode allows the algorithm to change independent of the practical algorithm of the customer.

Observer pattern: Defines a one-to-many dependency between objects, so that when an object changes state, objects that depend on it are notified and automatically updated

Decorator Mode: Dynamically attaches responsibility to the object. To extend functionality, decorators provide an alternative to inheritance.

OO Basics: Abstraction, encapsulation, polymorphism, inheritance

OO Principles: Encapsulating transformations

Multi-use combinations with less inheritance

Programming for interfaces, not for implementation

Designed for loose coupling between objects.

Open for extension, close for modification

　　

Design Pattern Learning