erd builder

also added during the checkout. In the object-oriented system design principles, the function must comply with the open-closed principle and be open to Modification and extension, therefore, we have to adopt a design mode-builder mode to implement the checkout function, because the internal processes of the checkout work are roughly the same, but the display is different, therefore, the builder mode can ad

PHP design mode-builder mode, PHP design mode Requirements Analysis: We received an order from BMW and Mercedes-Benz, who are responsible for defining the parts and models of the product, and we are responsible for the production and the simple description of the requirement. We need to design a design pattern for this requirement to better adapt to their needs. First of all we need a car model class to define all the components needed, which is call

Definition Separates the construction of a complex object from its representation so that different representations can be created during the same construction process. Such a design pattern is called the builder pattern. Applicability 1. When a complex object is created Algorithm It should be independent from the components of the object and their assembly methods. 2. When the constructor must allow different representations of the constructed obje

The builder for the base class is definitely called in the builder of a derived class, and is gradually linked up so that the builder used by each base class can be called. The reason to do this is because the builder has a special task: to check whether the object is properly built.Let's take a look at an example that

backgroundDo not underestimate the little things on the small, want to go on a meal, it is necessary to obey the rules, step-by-step careful. I'm sure you've eaten a fast food without salt and eaten a fast food with a lot of salt. Since stir-frying is such a complicated process and must obey the rules, why not give him a death rule? If someone does not follow the rules, the corresponding alert warning will be made. This is the origin of the builder pa

PHP design mode-builder mode The builder pattern is also called the generator pattern, and the core idea is to separate the construction of a complex object from its representation so that the same build process can create different representations, which are called builder patterns. For example: Cars, his engine engine has a lot of brands, tires also have a v

Php design mode-builder mode, php design mode Requirement Analysis: We received an order from BMW and Mercedes Benz, which defines the parts and models of the product. We are responsible for production, and the requirement is simply described as follows. We need to design a design model for this requirement to better adapt to their needs. First, we need a car model class to define all the required parts. This is called an abstract class because we may

Recently, when learning the picture loading frame glide, he was shocked by his streamlined wording. In a word, it can be done.Glide.with (mcontext). load (URL) . Centercrop () . Placeholder (r.drawable.default_img) . Crossfade ( ) . into (Mimageview);　At the same time at the beginning of the year, when learning Rxjava, with a chain-style programming is very elegant. Observable . Just ("1", "2") . Subscribeon (Schedulers.io ())

First, the builder model(Builder)The factory class pattern provides the pattern of creating a single class, while the builder pattern is to centralize the various products to manage, to create composite objects, so-called composite objects that refer to a class that has different properties, in fact the builder pattern

· Borland C++builder 5.0 Tutorial (1) · Borland C++builder 5.0 Tutorial (2) · Borland C++builder 5.0 Tutorial (3) · Borland C++builder 5.0 Tutorial (4) · Borland C++builder 5.0 Tutorial (5) · Borland C++builder 5.0 Tutorial (

Problems to solve: The object I created is more complex, and the member functions inside the object represent different instances with different implementations, in other words, the same object-building process can have different representations. For example, I went to eat crossing that day, they have different packages, the package contains the same kind of, have a bowl of rice noodles, a cold dish, a drink. But the 3 of different packages are not all the same. At this point, we can use the

Defined(I read the book after the two version of the Chinese and English found that the builder model to understand the nine out of the box, so directly to the online search for other people's analysis, so the majority of this chapter is based on the information collected on the Internet, in addition, the code example shows that the example of this book is inappropriate, also changed, so this chapter and the ）The