java建造者模式

学习连接：http://xiandaoyan.iteye.com/blog/675997

建造者模式：将一个复杂对象的建构与它的表示分离，使得同样的建构过程可以创建不同的表示。建造者是在当创建复杂对象的算法应该独立于该对象的组成部分以及它们的装配方式时适用的模式。

package builder;

public class Product {
	ArrayList<String> parts = new ArrayList<String>();
	
	public void add(String part)
	{
		parts.add(part);
	}
	
	public void show()
	{
		System.out.println("产品创建------------");
		
		for(String part : parts)
		{
			System.out.println(part);
		}
	}
}

public abstract class Builder {
	public abstract void BuildPartA();
	
	public abstract void BuildPartB();
	
	public abstract Product getResult();
}

public class ConcreteBuilder1 extends Builder{
	
	private Product product = new Product();
	@Override
	public void BuildPartA() {
		product.add("部件A");
	}
	@Override
	public void BuildPartB() {
		product.add("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("部件x");
	}
	@Override
	public void BuildPartB() {
		product.add("部件y");
	}
	@Override
	public Product getResult() {
		return product;
	}
	
}
public class Director {
	
	public void Construct(Builder builder)
	{
		builder.BuildPartA();
		builder.BuildPartB();
	}
}

public class TestBuilder {
	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();
		
		director.Construct(b2);
		Product p2 = b2.getResult();
		p2.show();
	}
}