创建型模式 --- 建造者模式

public class Product {
    private String aaa;
    
    private String bbb;

    public String getAaa() {
        return aaa;
    }

    public void setAaa(String aaa) {
        this.aaa = aaa;
    }

    public String getBbb() {
        return bbb;
    }

    public void setBbb(String bbb) {
        this.bbb = bbb;
    }

    @Override
    public String toString() {
        return "Product [aaa=" + aaa + ", bbb=" + bbb + "]";
    }
    
}

public interface ProductBuilder {
    
    void buildAaa();

    void buildBbb();

    Product getProduct(); 
}

public class AProduct implements ProductBuilder{
    private Product product = new Product();
    
    @Override
    public void buildAaa() {
        product.setAaa("AProduct-aaa");
    }

    @Override
    public void buildBbb() {
        product.setBbb("AProduct-bbb");
    }

    @Override
    public Product getProduct() {
        return product;
    }

}

public class BProduct implements ProductBuilder{
    private Product product = new Product();
    
    @Override
    public void buildAaa() {
        product.setAaa("BProduct-aaa");
    }

    @Override
    public void buildBbb() {
        product.setBbb("BProduct-bbb");
    }

    @Override
    public Product getProduct() {
        return product;
    }

}

public class Director {
    public Product build(ProductBuilder productBuilder) {
        productBuilder.buildAaa();
        productBuilder.buildBbb();
        return productBuilder.getProduct();
    }
}

public class Client {
    public static void main(String[] args) {
        AProduct aProduct = new AProduct();
        BProduct bProduct = new BProduct();
        
        Director director = new Director();
    
        Product aObj = director.build(aProduct);
        Product bObj = director.build(bProduct);
        
        
        System.out.println("aObj==>" + aObj);
        System.out.println("bObj==>" + bObj);
    }
}