建造者模式

r囧r小猫 2022-01-14 22:37 221阅读 0赞

[2019独角兽企业重金招聘Python工程师标准>>> ][2019_Python_] ![hot3.png][]

1、产品类

package com.hhdys.product;
    
    import java.util.ArrayList;
    import java.util.List;
    
    /**
     * Created by zhangkai on 16/5/31.
     */
    public class Product {
        public Product(String name) {
            this.name = name;
        }
    
        private String name;
    
        private List<String> parts=new ArrayList<String>();
    
        public void add(String part){
            parts.add(part);
        }
    
        public void show(){
            System.out.println(name+"产品开始组装====");
            for(String part:parts){
                System.out.println("产品组成部分:"+part);
            }
        }
    
    }

2、抽象建造者类

package com.hhdys.product;
    
    /**
     * Created by zhangkai on 16/5/31.
     */
    public abstract class Builder {
        public abstract void builderPartA();
        public abstract void builderPartB();
        public abstract Product getResult();
    }

3、A产品建造类

package com.hhdys.product;
    
    /**
     * Created by zhangkai on 16/5/31.
     */
    public class ConcreteBuilderA extends Builder {
        Product product=new Product("A");
        @Override
        public void builderPartA() {
            product.add("A部件");
        }
    
        @Override
        public void builderPartB() {
            product.add("B部件");
        }
    
        @Override
        public Product getResult() {
            return product;
        }
    }

4、B产品建造类：

package com.hhdys.product;
    
    /**
     * Created by zhangkai on 16/5/31.
     */
    public class ConcreteBuilderB extends Builder {
        Product product=new Product("B");
        @Override
        public void builderPartA() {
            product.add("X部件");
        }
    
        @Override
        public void builderPartB() {
            product.add("Y部件");
        }
    
        @Override
        public Product getResult() {
            return product;
        }
    }

5、指挥者类：

package com.hhdys.product;
    
    /**
     * Created by zhangkai on 16/5/31.
     */
    public class Director {
        public void construct(Builder builder){
            builder.builderPartA();
            builder.builderPartB();
        }
    }

6、主程序：

package com.hhdys.main;
    
    import com.hhdys.product.ConcreteBuilderA;
    import com.hhdys.product.ConcreteBuilderB;
    import com.hhdys.product.Director;
    import com.hhdys.product.Product;
    
    /**
     * Created by zhangkai on 16/5/31.
     */
    public class ProductMain {
        public static void main(String[] args){
            Director d=new Director();
            ConcreteBuilderA a=new ConcreteBuilderA();
            d.construct(a);
            Product result = a.getResult();
            result.show();
    
    
            ConcreteBuilderB b=new ConcreteBuilderB();
            d.construct(b);
            Product result2 = b.getResult();
            result2.show();
        }
    }

7、运行结果：

A产品开始组装====
    产品组成部分:A部件
    产品组成部分:B部件
    B产品开始组装====
    产品组成部分:X部件
    产品组成部分:Y部件

8：总结：

解耦的同时，保证了不会丢失任何步骤。

转载于:https://my.oschina.net/hhdys412/blog/684767

[2019_Python_]: https://my.oschina.net/u/2663968/blog/3061697
[hot3.png]: /images/20220114/a13fa67907c0494ea26cb11058ce348f.png