建造者模式
建造者模式（Builder Pattern）使用多个简单的对象一步一步构建成一个复杂的对象。 这种类型的设计模式属于创建型模式，它提供了一种创建对象的最佳方式。
比如：StringBuilder
实际案例
类信息概览：
| 类名 | 说明 |
|---|---|
| Main.java | 方法的总入口 |
| PersonGirlBuilder.java | |
| PersonBoyBuilder.java | |
| Person.java | |
| PersonBuilder.java | |
| PersonDirector.java |
定义
- PersonGirlBuilder.java
package com.ryo.design.pattern.note.builder;
/**
* Created by bbhou on 2017/8/9.
*/
public class PersonGirlBuilder implements PersonBuilder {
@Override
public String buildName() {
return "rose";
}
@Override
public int buildAge() {
return 19;
}
@Override
public String buildSex() {
return "girl";
}
}
- PersonBoyBuilder.java
package com.ryo.design.pattern.note.builder;
/**
* Created by bbhou on 2017/8/9.
*/
public class PersonBoyBuilder implements PersonBuilder {
@Override
public String buildName() {
return "jack";
}
@Override
public int buildAge() {
return 20;
}
@Override
public String buildSex() {
return "boy";
}
}
- Person.java
package com.ryo.design.pattern.note.builder;
import lombok.Data;
/**
* Created by bbhou on 2017/8/9.
*/
@Data
public class Person {
/**
* 名称
*/
private String name;
/**
* 年龄
*/
private int age;
/**
* 性别
*/
private String sex;
}
- PersonBuilder.java
package com.ryo.design.pattern.note.builder;
/**
* Created by bbhou on 2017/8/9.
*/
public interface PersonBuilder {
/**
* 构建名称
* @return
*/
String buildName();
/**
* 构建年龄
* @return
*/
int buildAge();
/**
* 构建性别
* @return
*/
String buildSex();
}
- PersonDirector.java
package com.ryo.design.pattern.note.builder;
/**
* Created by bbhou on 2017/8/9.
*/
public class PersonDirector {
private PersonBuilder personBuilder;
public PersonDirector(PersonBuilder personBuilder) {
this.personBuilder = personBuilder;
}
/**
* 创建一个人
* @return
*/
Person createPerson() {
Person person = new Person();
person.setAge(personBuilder.buildAge());
person.setName(personBuilder.buildName());
person.setSex(personBuilder.buildSex());
return person;
}
}
测试
- Main.java
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
* Copyright (c) 2012-2018. houbinbini Inc.
* design-pattern All rights reserved.
*/
package com.ryo.design.pattern.note.builder;
/**
* <p> </p>
*
* <pre> Created: 2018/5/9 下午7:45 </pre>
* <pre> Project: design-pattern </pre>
*
* @author houbinbin
* @version 1.0
* @since JDK 1.7
*/
public class Main {
public static void main(String[] args) {
PersonDirector personDirector = new PersonDirector(new PersonBoyBuilder());
Person person = personDirector.createPerson();
System.out.println(person);
}
}
- 测试结果
Person(name=jack, age=20, sex=boy)
实现方式
UML & Code
UML
UML 图示如下
Code
代码地址
