建造者模式也叫生成器模式，是一种对象创建型模式，用来隐藏复合对象的创建过程，它把复合对象的创建过程加以抽象，通过子类继承或重载的方式，动态的创建具有复合属性的对象。

应用场景：

-对象的创建：Builder模式是为对象的创建而设计的模式

-创建的是一个复合对象：被创建的对象为一个具有复合属性的复合对象

-关注对象创建的各部分的创建过程：不同的工厂（这里指builder生成器）对产品属性有不同的创建方法

复合属性的对象（即要创建的对象）：

public class House {

	private String floor;
	
	private String wall;
	
	private String proof;

	public String getFloor() {
		return floor;
	}

	public void setFloor(String floor) {
		this.floor = floor;
	}

	public String getWall() {
		return wall;
	}

	public void setWall(String wall) {
		this.wall = wall;
	}

	public String getProof() {
		return proof;
	}

	public void setProof(String proof) {
		this.proof = proof;
	}
	
}

public interface HouseBuilder {

	public void makeFloor();
	
	public void makeWall();
	
	public void makeProof();
	
	public House getHouse();
}

具体创建者实现类1：

public class ApartmentBuilder implements HouseBuilder {
	private House house = new House();
	
	@Override
	public House getHouse() {
		return house;
	}
	
	@Override
	public void makeFloor() {
		house.setFloor("Apartment --> Floor");
	}

	@Override
	public void makeWall() {
		house.setWall("Apartment --> Wall");
	}

	@Override
	public void makeProof() {
		house.setProof("Apartment --> Proof");
	}

}

public class VillaBuilder implements HouseBuilder {
	private House house = new House();
	
	@Override
	public void makeFloor() {
		house.setFloor("Villa --> Floor");
	}

	@Override
	public void makeWall() {
		house.setWall("Villa --> Wall");
	}

	@Override
	public void makeProof() {
		house.setProof("Villa --> Proof");
	}

	@Override
	public House getHouse() {
		return house;
	}

}

设计者类：

public class HouseDirector {

	public void makeHouse(HouseBuilder builder) {
		builder.makeFloor();
		builder.makeProof();
		builder.makeWall();
	}
}

客户端调用类：

public class ClientApp {

	public static void main(String[] args) {
		
//		HouseBuilder builder = new ApartmentBuilder();
		HouseBuilder builder = new VillaBuilder();
		HouseDirector director = new HouseDirector();
		director.makeHouse(builder);
		House house = builder.getHouse();
		
		System.out.println(house.getFloor());
		System.out.println(house.getProof());
		System.out.println(house.getWall());
	}

}

设计模式之建造者模式