设计模式＝＝建造模式（Builder）

/*
 * 建造模式（Builder）
 *
 *
 * 将一个对象的内部表象和建造过程分割，一个建造过程可以造出不同表象的对象。可简化为模版方法模式.
 */

package model;

public class TestBuilder {
    public static void main(String[] args) {
        Builder b = new BuilderImpl1();
        Director d = new Director(b);
        Product p = d.createProduct();
    }
}

interface Builder {
    void buildPart1();

    void buildPart2();

    void buildPart3();

    Product getProduct();
}

class BuilderImpl1 implements Builder {
    public void buildPart1() {
        System.out.println("create part1");
    }

    public void buildPart2() {
        System.out.println("create part2");
    }

    public void buildPart3() {
        System.out.println("create part3");
    }

    public Product getProduct() {
        return new Product();
    }
}

class Director {
    Builder b;

    public Director(Builder b) {
        this.b = b;
    }

    public Product createProduct() {
        b.buildPart1();
        b.buildPart2();
        b.buildPart3();
        return b.getProduct();
    }
}

class Product {
}