设计模式——建造者模式(代码基本参考自《大话设计模式》)

public  abstract class Builder {
	public abstract void buildPartA();
	public abstract void buildPartB();
	public abstract Product getResult();
}

public class Product {
	List<String> parts = new LinkedList<String>();
	
	public void Add(String part) {
		parts.add(part);
	}
	
	public void show() {
		for(String part : parts) {
			System.out.println(part);
		}
	}
}

public class ConcreteBuilder1 extends Builder{
	private Product product = new Product();

	@Override
	public void buildPartA() {
		product.Add("建造部件 A ");
	}

	@Override
	public void buildPartB() {
		product.Add("建造部件 B ");
	}

	@Override
	public Product getResult() {
		return product;
	}	
}

public class ConcreteBuilder2  extends Builder{
	private Product product = new Product();
	
	@Override
	public void buildPartA() {
		product.Add("建造部件 X ");
	}

	@Override
	public void buildPartB() {
		product.Add("建造部件 Y ");
	}

	@Override
	public Product getResult() {
		return product;
	}

}

public class Director {
	public void construct(Builder builder) {
		builder.buildPartA();
		builder.buildPartB();
	}
}

public class DemoEnter {
	public static void main(String[] args) {
		Director director = new Director();
		Builder b1 = new ConcreteBuilder1();
		Builder b2 = new ConcreteBuilder2();
		
		director.construct(b1);
		Product p1 = b1.getResult();
		p1.show();
	}
}