建造者模式

建造者模式是对象的创建模式，可以将一个产品的内部表现与产品的生产过程分隔开，从而可以使一个建造过程生成具有不同内部表象的产品。

//产品类
class Product{
    //产品的内部表象
    private String part1;
    private String part2;
    public String getPart1() {
        return part1;
    }
    public void setPart1(String part1) {
        this.part1 = part1;
    }
    public String getPart2() {
        return part2;
    }
    public void setPart2(String part2) {
        this.part2 = part2;
    }
}

//抽象建造者接口
interface Builder{
    public void buildPart1();
    public void buildPart2();
    public Product getProduct();
}

//具体建造者类
class ConcreteBuilder implements Builder{

    //持有产品实例
    private Product product = new Product();
    
    //构建产品第一部分
    @Override
    public void buildPart1() {
        product.setPart1("");
    }

    //构建产品第二部分
    @Override
    public void buildPart2() {
        product.setPart2("");
    }

    //获得产品
    @Override
    public Product getProduct() {
        return product;
    }
    
}

//导演者类
class Director{
    private Builder builder;
    
    public Director(Builder builder){
        this.builder = builder;
    }
    
    //产品的构建
    public void construct(){
        builder.buildPart1();
        builder.buildPart2();
    }
}

public class MyTest {

    /**
     * @param args
     */
    public static void main(String[] args) {
        Builder builder = new ConcreteBuilder();
        Director director = new Director(builder);
        director.construct();
        Product product = builder.getProduct();
    }

}