Programmers need to know!Practical application and case study of the generator pattern - Programmer Good.
The Generator pattern is a creative design pattern that provides an optimal way to build an object, this pattern allows users to build a complex object through a set of predefined steps without caring about the specific implementation details inside it, the core idea of the generator pattern is to separate the construction process of a complex object from its representation process, so that the same build process can create different representations.
Programmers need to know!Practical application and case study of the generator pattern - Programmer Good.
When building complex objects, if you use the constructor directly, it may be difficult to understand and use because there are too many parameters, and the generator pattern solves this problem by dividing the construction process into steps, each step corresponds to a part or property of the object, so that building complex objects becomes simple. The generator mode also allows users to selectively set properties or components when building objects, and users can create objects with different configurations as needed, without having to define a bunch of constructors or factory methods, and the generator mode hides the building process of the object in the generator class, and the client only needs to deal with the public interface of the generator, and does not need to care about how the object is implemented internally.
The Generator Pattern is a very useful design pattern that helps us better manage and build complex objects, by breaking down the process of building objects into a series of steps and providing flexible property setting options, the Generator pattern makes the process of creating objects clearer, simpler, and maintainable. At the same time, by hiding the internal implementation details of the object, the generator mode reduces the coupling and improves the reusability and maintainability.
Programmers need to know!Practical application and case study of the generator pattern - Programmer Good.
Here's a counter-example of a generator pattern that isn't used
public class product
..getter and setter methods
public static void main(string args)
productClasses have several properties, including:partapartbwithpartc。In order to buildproductobject, we provide a constructor that receives all the required parameters. Inmainmethod, we created oneproductobject and provides all the required parameters.
However, there are several problems with this approach:
Too many constructor arguments: ifproductClasses have more properties, and the constructor's list of arguments becomes very large, making it difficult to read and understand. Poor flexibility: The client must provide all required parameters in order to createproductobjects, even if some parameters are not necessary for a particular use case, which limits the flexibility of the client, as the client cannot optionally set the properties of the object. Internal implementation details exposed: By setting the object's properties directly in the constructor, the client may be exposedproductThe internal implementation details of the class, which increases the coupling degree and is not conducive to the maintenance and scaling. To solve these problems, you can use the generator pattern to refactor.
The Builder pattern simplifies the process of building complex objects and provides a more flexible and maintainable way to build objects by breaking down the process of building an object into a series of steps, each corresponding to a property or component of the object.
Here's a positive example of using the generator pattern:
Product category
public class product
..getter method
Product Builder class
public static class productbuilder
public productbuilder setpartb(string partb)
public productbuilder setpartc(string partc)
..Other ways to set it up
public product build()
public static void main(string args)
productObject. First, we define oneproductbuilderclass as a generator, the class contains the same as theproductclass, and provides a range of setup methods that allow the client to selectively set the object's properties as needed, and return the generator object itself to support chained calls, and then, through the callsbuild()method, the generator will build a complete oneproductobject and return to the client.
Programmers need to know!Practical application and case study of the generator pattern - Programmer Good.
The Generator Pattern, this creative design pattern, is really like an ingenious architect in the programming world.
Imagine that you want to build a house, not just stacking bricks at random, but building it step by step according to a well-designed blueprint, which is the core idea of the generator pattern:Break down the process of building complex objects into a series of straightforward steps。This has many benefits, not only to make ** as smooth and easy to read as a poem, but also easier to maintain and expand later.
For objects that have multiple constructor arguments, or that require complex steps to spawn, the generator pattern is a lifesaver, reducing the burden on constructors and avoiding the embarrassment of having too many arguments, and making the process of creating objects as intuitive as reading a storybook. What's even better is that it also gives ** more flexibility, the client can freely choose and configure the properties of the object according to their preferences and needs, just like in a cafeteria, you can choose the ingredients according to your taste, rather than being limited to a fixed menu.
At the same time, it is also a low-key master, it cleverly hides the internal working mechanism of the object, so that the parts of the ** can coexist more harmoniously, reduce the degree of coupling, and improve the overall maintainability and scalability.