角色：

• Buidler 抽象建造者
• ConcreteBuilder 具體建造者
• Director 指揮者(可以省略)
• Product 產(chǎn)品

建造者模式(盜圖)

1. 抽象產(chǎn)品類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  學(xué)校：" + uName +
                "\n  校齡：" + uAge +
                "\n  地址：" + uAddress +
                "\n}";
    }
}

2.抽象建造者類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.具體產(chǎn)品類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.具體建造者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.指揮者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.測試

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

        director.construct("河南大學(xué)",104,"河南開封");

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

運行結(jié)果：
HenanUniversity: { 學(xué)校：河南大學(xué) 校齡：104 地址：河南開封 }

挖坑。這里并不了解實際的使用場景。鴻洋大神的封裝OkHttpUtils使用到了建造者模式，學(xué)習查看OkHttpUtls如何封裝的時候，一開始代碼看的有點懵，慢慢才看懂。這里簡單記錄一下。希望以后再看到采用Builder模式封裝的庫可以有些幫助。以后對設(shè)計模式有些了解后，再來補充。

2016.08.22 17:06