design patterns explained simply

objects; The new object is used to re-use its existing functions by delegating methods that call existing objects. In short: Use the combination/aggregation relationship as much as possible, with less inheritance.7, Dimitri Law (least known principle) (Demeter Principle)Why is it called the least known principle, that is to say: an entity should be as small as possible interaction with other entities, so that the system function module is relatively independent. This means that a software entit

all, there are multiple inheritance relationships, and as the concrete implementation increases, the inheritance of subclasses becomes very complicated, and secondly, if there are new abstractions or new concrete implementation roles, we have to re-modify the static relationship in the existing system to adapt to the new role. This violates the open-closed principle. The correct design should be to use two separate hierarchical structures to encapsul

Design patterns:solidify Your C # application architecture with design Patterns Chinese version (previous) optimizer (translation) Keyword design pattern singleton strategy Decorator Composite State SOURCE http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnmag01/html/PATTERNS.asp

Design patterns give me a lot of benefits, there are more than 20 kinds of design patterns in Java, and there are five common design patterns in PHP, let's take a closer look at the factory pattern in PHP

Design Patterns: Solidify Your C # Application Architecture with Design Patterns Chinese edition (Part 1) optimizer)Keyword Design Pattern singleton strategy decorator composite stateSource http://msdn.microsoft.com/library/default.asp? Url =/library/en-us/dnmag01/html/

In the design pattern, the factory method pattern is a relatively simple design pattern, which is widely used, but also one of the most important design patterns. In many places, we will see the class named xxxfactory. So, what is factory method? Why should we use this mode? How can we use Java to implement this mode?

design Pattern A book introduces design patterns into the software community, the authors of which are Erich Gamma, Richard Helm, Ralph Johnson and John vlissides (commonly known as "gang"). The core concept behind the design pattern described is very simple. After years of software development practice, Gamma and othe

I was overjoyed and excited when I knew I had the opportunity to get this book. Because I used to learn the design pattern n times before, the four-person gang's design pattern was also borrowed from the library. I have never read it once, and I put it down after several pages. I feel that the design mode is terrible. However, it is what programmers have to learn

design mode A book introduces design patterns to the software community, which is written by Erich Gamma, Richard Helm, Ralph Johnson, and John vlissides design (commonly known as "Gang of Four"). The core concepts behind the design patt