角色：

• Buidler 抽象建造者
• ConcreteBuilder 具体建造者
• Director 指挥者(可以省略)
• Product 产品

建造者模式(盗图)

1. 抽象产品类University

public abstract class University {
    protected String uName;
    protected int uAge;
    protected String uAddress;

    protected University() {

    }

    public abstract void setName(String name);

    public abstract void setAge(int age);

    public abstract void setAddress(String address);

    @Override
    public String toString() {
        return this.getClass().getSimpleName() + ":\n{" +
                "\n  学校：" + uName +
                "\n  校龄：" + uAge +
                "\n  地址：" + uAddress +
                "\n}";
    }
}

2.抽象建造者类UniversityBuilder

public abstract class UniversityBuilder<T extends University> {
    public abstract   T builder();

    public abstract void setName(String name);

    public abstract void setAge(int age);

    public abstract void setAddress(String address);
}

3.具体产品类HenanUniversity

public class HenanUniversity extends University {

    protected HenanUniversity() {
    }

    @Override
    public void setName(String name) {
        uName = name;
    }

    @Override
    public void setAge(int age) {
        uAge = age;
    }

    @Override
    public void setAddress(String address) {
        uAddress = address;
    }
}

4.具体建造者HenanUniversityBuilder

public class HenanUniversityBuilder extends UniversityBuilder <HenanUniversity>{
    private HenanUniversity henanUniversity = new HenanUniversity();

    @Override
    public HenanUniversity builder() {
        return henanUniversity;
    }

    @Override
    public void setName(String name) {
        henanUniversity.setName(name);
    }

    @Override
    public void setAge(int age) {
        henanUniversity.setAge(age);
    }

    @Override
    public void setAddress(String address) {
        henanUniversity.setAddress(address);
    }
}

5.指挥者HenanUniversityDirector

public class HenanUniversityDirector {
    private HenanUniversityBuilder builder;

    public HenanUniversityDirector(HenanUniversityBuilder builder) {
        this.builder = builder;
    }

    public void construct(String name, int age , String address){
        builder.setName(name);
        builder.setAge(age);
        builder.setAddress(address);
    }
}

6.测试

public class BuilderDemo {
    public static void main(String[]args){
        HenanUniversityBuilder builder = new HenanUniversityBuilder();
        HenanUniversityDirector director = new HenanUniversityDirector(builder);

        director.construct("河南大学",104,"河南开封");

        HenanUniversity henanUniversity =  builder.builder();
        System.out.println(henanUniversity);
    }
}

运行结果：
HenanUniversity: { 学校：河南大学 校龄：104 地址：河南开封 }

挖坑。这里并不了解实际的使用场景。鸿洋大神的封装OkHttpUtils使用到了建造者模式，学习查看OkHttpUtls如何封装的时候，一开始代码看的有点懵，慢慢才看懂。这里简单记录一下。希望以后再看到采用Builder模式封装的库可以有些帮助。以后对设计模式有些了解后，再来补充。

2016.08.22 17:06