Detailed explanation of the builder pattern example of Java design pattern

This paper describes the builder pattern of Java design pattern. Share with you for your reference, as follows:

The builder pattern can separate a component from its assembly process Create a complex object step by step.

Users only need to specify the type of complex object to get the object without knowing its internal specific construction details

When will the builder mode be used?

Personally, when the objects we create need logic when they are created.

For example, if we want to create a simple POJO object, we can directly create new without any logic.

When there is a complex object and you want to create it, there is a logical relationship between its properties.

The assignment value of an attribute depends on other attributes. Then the creation of this object is not simply new.

Before creating, we must write this logic clearly.

The construction mode makes customers don't need to know much about the internal details of the product. It encapsulates the composition and representation of complex objects in a specific construction role, and the instructor coordinates the builder role to obtain a specific product instance.

Its model:

Abstract product

Specific product category Movie Book

Abstract builder

Specific builder moviebuilder bookbuilder

Commander director

Test:

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