设置模式，建造模式学习笔记

建造模式的作用，把一个复杂对象的构建与它的表示分离开来。

一般通用的建造者模式的uml类图：

Builder接口，定义了需要建造对象过程中需要使用的方法；

需要通过建造模式，构建对象的类，需要实施Builder接口，比如SonBuilderImp2，SonBuilderImp1；

Director类，通过成员变量builder，可以按照指定的一些特性，来构造复杂对象；

以一个肯德基点餐的例子进行说明：

有鸡腿、汉堡组成不同的套餐，套餐1包含鸡腿、汉堡，套餐2只包含鸡腿。

使用建造模式的设计思路，可以这样设计：

Build接口，包含鸡腿、汉堡两个方法；

套餐1，套餐2分别来实施Builder接口；

Director通过builder的调用，建造不同的套餐。

package com.learn.design.builder;

/**
 * Created by liuyingzi on 2018/9/5.
 * 公共接口，构造复杂对象需要使用到的方法
 */
public interface KFCBuilder {
    public void jitui();
    public void hanbao();
}

package com.learn.design.builder;

/**
 * Created by liuyingzi on 2018/9/5.
 */
public class TaocanKFCBuilder1 implements  KFCBuilder{
    @Override
    public void hanbao() {
        System.out.println("汉堡:"+this.getClass());
    }

    @Override
    public void jitui() {
        System.out.println("鸡腿:"+this.getClass());
    }
}
package com.learn.design.builder;

/**
 * Created by liuyingzi on 2018/9/5.
 */
public class TaocanKFCBuilder2 implements  KFCBuilder{
    @Override
    public void hanbao() {
        System.out.println("汉堡:"+this.getClass());
    }

    @Override
    public void jitui() {
        System.out.println("鸡腿:"+this.getClass());
    }
}
package com.learn.design.builder;

/**
 * Created by liuyingzi on 2018/9/5.
 */
public class KFCDirector {
    public  KFCBuilder builder;
    public  TaocanKFCBuilder1 createModel1(){
        TaocanKFCBuilder1 taocan1 = new TaocanKFCBuilder1();
        builder = taocan1;
        builder.hanbao();
        builder.jitui();
        return taocan1;
    }
    public  TaocanKFCBuilder2 createModel2(){
        TaocanKFCBuilder2 taocan2 = new TaocanKFCBuilder2();
        builder = taocan2;
        builder.hanbao();
//        builder.jitui();
        return taocan2;
    }
}
package com.learn.design.builder;

/**
 * Created by liuyingzi on 2018/9/5.
 */
public class MainTest {
    /**
     *
     * @param args
     */
    public static void main(String[] args){
        KFCDirector director = new KFCDirector();
        TaocanKFCBuilder1 modle1 = director.createModel1();
        TaocanKFCBuilder2 modle2 = director.createModel2();
    }
}