Design Patterns-Builders

First, the definition

Separates the construction of a complex object from its representation so that the same construction process can create different representations

The user only needs to specify the type to be built to get them, the construction process and details do not need to know

Type: Create Type

Second, the application scenario

If an object has a very complex internal structure (many properties)

Want to separate the creation and use of complex objects

Third, the advantages

1, good sub-assembly, create and use the separation

2. Good extensibility, independent and some degree of decoupling between construction classes

Iv. shortcomings

1. Generate Redundant builder objects

2, the product internal changes, the builders have to revise, the cost is larger

Design Patterns-Builders