design patterns easy to understand

, each of which has different property values;b) A class it needs to create several kinds of objects, each of which is a subclass of a parent class/interface;The policy class created by the policy mode can only be the second one, and all subclasses must have a common function so that the contextinterface () Call of the context class.The role of the policy model:1. After using the policy mode, if you need to add a policy, you just need to create a subclass that implements the strategy interface,

indeterminate steps in the template function are replaced by abstract functions; When the client wants to use this template function, it needs to create a subclass and override the abstract function of the abstract class.When to use?When a similar function is used in more than one place, it is common practice to copy the code and change some places slightly. The reuse rate for this practice code is too low.The right thing to do: encapsulate functionally similar parts into a function, where you

[i] j) I++; //less than the swap position, equal to stop if(I j) {T=Strdate[i]; Strdate[i]=Strdate[j]; STRDATE[J]=BT; } } //Two when the pointer is equal, the value of the first position is swapped with the value at the same position, completing the first round of sortingStrdate[left] =Strdate[i]; Strdate[i]=key; QuickSort (Strdate, left, I-1);//proceed to the left, here is a recursive processQuickSort (strdate, i + 1, right);//proceed to the right, here is a recursive p

First Lecture: 1. Object-oriented design patterns and principles Introduction to Design Patterns: Each pattern describes a problem that recurs around us, and the core of the solution to the problem.--christopher alexander{Architect} Software designers ' understanding of the concept of

-UML class diagrams are often used to describe the static structure between classes when describing the design mode. The purpose of this article is to allow the readers to understand the UML class diagrams and to figure out several relationships in the UML class diagrams. -In the subsequent design model learning process, only these two points are adequate. More a

In the previous Java 23, you learned about the singleton mode and Factory mode of design mode. Here, the design pattern is introducedPrinciple of object-oriented thought designIn the actual development, we want to understand the object-oriented thinking more deeply, we must be familiar with the design principles of the

Second use of design patterns (memorandum patterns), design patterns memos Our company has a very awesome girl who is one of the core figures in our project team. I usually ask her if I don't understand anything. Just yesterday we

Design Mode----Design Mode Summary (end) From the study of design patterns to the study of visitor patterns, the learning process of my design patterns has ended. This process laste

Php design patterns ------- (1) policy patterns, design patterns ------- I. Why do I need to learn design patterns. My last project was an App interface. Due to the tight schedule, my b

23 design patterns (18) java memorandum patterns, 23 Design Patterns 23 design patterns Article 18th: java memorandum patterns Definition: c

Php design patterns-summary, php design patterns --. Notes on php design patterns-summary, php design patterns-1. general definitions of the

Php design patterns-Abstract Factory patterns, design patterns Factory Before learning this chapter, read the simple factory mode and factory method mode. Under what circumstances should the abstract factory model be used:1. A system should not depend on the details of how p