Benefits of the builder model

Definition

Separate the construction of a complex object from its representation , So that the same build process can create different representations .

advantage

The main advantages of using the builder model are as follows ：
1. Change the code without changing the original code
2. If a class construction method is particularly complex , Parameters are optional , It's empty , Controlling with constructors can be complicated
3. call chaining , It's easy to see what the logic of calling is , It mainly helps programmers clarify their ideas

Android Builder mode in

for instance , Very common Builder The pattern is AlertDialog.Builder, A pop-up window , Its simple use has also been written before ：
Android in AlertDialog Simple use