♥建造模式：

produce檔案（省略setter，getter等等）:

public class Produce {
    private  String a;
    private  String b;
    private  String c;
    private  String d;
}

方式一：該方式分為 ：產品Produce，建造者（抽象）Bulider，建造者（具體）Worker，♠指揮者 Director

注：由具體實現抽象，在具體中可以為produce中引數的賦值等操作，但是此時不呼叫不會賦值，只有通過指揮者的方法或者有參構造器進行對抽象方法的呼叫。

最後測試時為指揮者傳入具體的建造者，並且呼叫獲得produce

建造者（抽象）：

public abstract class Builder {
    public abstract void setAA();
    public abstract void setBB();
    public abstract void setCC();
    public abstract void setDD();

    public  abstract  Produce getPeoduct();
}

抽象者（具體）：

public class Worker extends  Builder {
    //由具體建造者的無參構造方法new產品
 
    private  Produce p;
    public Worker() {
        p=new Produce();
    }

    @Override
    public void setAA() {
        p.setA("注入A");
    }
    @Override
    public void setBB() {
        p.setB("注入b");
    }
    @Override
    public void setCC() { p.setC("注入c"); }
    @Override
    public void setDD() { p.setD("注入D"); }
 

    @Override
    public Produce getPeoduct() {
        return p;
    }
}
指揮者：

public class Director {
    public Produce getProduct(Builder builder){
        builder.setAA();
        builder.setBB();
        builder.setCC();
        builder.setDD();

        return builder.getPeoduct();
    }
}
測試：

Director director = new Director();
Produce p = director.getProduct(new Worker());
System.out.println(p.toString());

方式二：給方式將指揮者角色的功能賦予使用者
建造者（抽象）：

public abstract class Builder {
    public abstract Builder setAA(String msg);
    public abstract Builder setBB(String msg);
    public abstract Builder setCC(String msg);
    public abstract Builder setDD(String msg);

    public  abstract  Produce getPeoduct();
}

抽象者（具體）：依舊new物件，並且在這裡對物件中屬性賦值操作是返回的還是抽象者本身，最終要通過getProduct()方法實現獲取物件

public class Worker extends Builder {
    private  Produce p;
    public Worker() {
        p=new Produce();
    }
    @Override
    public Builder setAA(String msg) {
        p.setA(msg);
        return this;
    }
    @Override
    public Builder setBB(String msg) {
        p.setB(msg);
        return this;
    }
    @Override
    public Builder setCC(String msg) {
        p.setC(msg);
        return this;
    }
    @Override
    public Builder setDD(String msg) {
        p.setD(msg);
        return this;
    }
    
    @Override
    public demo2.Produce getPeoduct() {
        return p;
    }
}

測試：

Worker worker = new Worker();
Produce peoduct = worker.setAA("lala").setBB("hahah").getPeoduct();//通過鏈式程式設計實現對屬性賦值
System.out.println(peoduct.toString());