[designmode] builder model

Basic introduction

1. Builder pattern （Builder Pattern） Also called generator mode , It's an object building pattern . It can abstract the construction process of complex objects （ Abstract categories ）, Different implementation methods of this abstract process can construct different representations （ attribute ） The object of .

2. Builder pattern Step by step to create a complex object , It allows users to build complex objects only by specifying their type and content , Users don't need to know the details of the internal construction .

1. Demand for housing projects

1. A house needs to be built ： This process is piling 、 Build a wall 、 Capping

2. There are all kinds of houses , For example, ordinary room , Tall building , villa , The process of all kinds of houses is the same , But don't ask for the same .

3. Please write the program , Fulfill demand .

2. The traditional way to solve the housing needs

Class diagram ：

Code ：

package com.mumu.builder;
public