1.策略模式

1.1 策略模式

1.2 策略模式的組成

  (1)抽象策略角色： 策略類，通常由一個介面或者抽象類實現。
  (2)具體策略角色：包裝了相關的演算法和行為。
類圖如下:
  

1.3 使用場景  

/**
 * @Title:商品抽象折扣類
 * @Description:TODO
 * @Company: Orclight's Studio
 * @author: shuzl  2013-3-12 下午03:24:53
 * @motto: Never put off what you can do today until Tomorrow
 * @version 1.0.0 
 */
public interface MemberStrategy {
	public double discountPrice(double bookPrice);
}

/**
 * @Title:初級會員--折扣類
 * @Description:TODO
 * @Company: Orclight's Studio
 * @author: shuzl  2013-3-12 下午03:53:59
 * @motto: Never put off what you can do today until Tomorrow
 * @version 1.0.0 
 */
public class JuniorMemberStrategy implements MemberStrategy{
	public double discountPrice(double bookPrice) {
		return bookPrice;
	}
}
 

/**
 * @Title:中級會員--折扣類
 * @Description:TODO
 * @Company: Orclight's Studio
 * @author: shuzl  2013-3-12 下午03:58:01
 * @motto: Never put off what you can do today until Tomorrow
 * @version 1.0.0 
 */
public class InterMediateMemberStrategy implements MemberStrategy{
	@Override
	public double discountPrice(double bookPrice) {
		return bookPrice*0.9;
	}
}
 

/**
 * @Title:高階會員--折扣類
 * @Description:TODO
 * @Company: Orclight's Studio
 * @author: shuzl  2013-3-12 下午03:59:30
 * @motto: Never put off what you can do today until Tomorrow
 * @version 1.0.0 
 */
public class AdvancedMemberStrategy implements MemberStrategy{
	@Override
	public double discountPrice(double bookPrice) {
		return bookPrice*0.8;
	}
}

/**
 * @Title:圖書價格類
 * @Description:TODO
 * @Company: Orclight's Studio
 * @author: shuzl  2013-3-12 下午04:15:57
 * @motto: Never put off what you can do today until Tomorrow
 * @version 1.0.0 
 */
public class BookPrice {
	private MemberStrategy strategy;
	private double price;
	/**
	 * @param strategy
	 */
	public BookPrice(MemberStrategy strategy,double price) {
		super();
		this.strategy = strategy;
		this.price=price;
	}
	/**
	 * 
	 * getRealBookPrice(獲取折扣後的價格)
	 * @return double
	 * @createDate 2013-3-12 下午04:30:26
	 * @since  1.0.0
	 */
	public double getRealBookPrice() {
		return strategy.discountPrice(this.price);
	}
	
	public MemberStrategy getStrategy() {
		return strategy;
	}
	public void setStrategy(MemberStrategy strategy) {
		this.strategy = strategy;
	}
}

/**
 * @Title:圖書打折後的價格--測試類
 * @Description:TODO
 * @Company: Orclight's Studio
 * @author: shuzl  2013-3-12 下午04:17:23
 * @motto: Never put off what you can do today until Tomorrow
 * @version 1.0.0 
 */
public class TestBookPrice {
	public static void main(String[] args) {
		MemberStrategy strategy=new AdvancedMemberStrategy();
		BookPrice bookPrice = new BookPrice(strategy,99.0);
		System.out.println("圖書價格是："+bookPrice.getRealBookPrice());
	}
}

2 模版方法模式

2.1 模版方法模式

2.2 應用場景

/**
 * @Title:模版方法抽象類--定義一個業務的骨架，而將一些實現步驟延遲到子類中
 * @Description:TODO
 * @Company: Orclight's Studio
 * @author: shuzl  2013-3-12 下午02:10:38
 * @motto: Never put off what you can do today until Tomorrow
 * @version 1.0.0 
 */
public abstract class AbstractTemplate {
	/**
	 * 
	 * executeMain(需要在子類實現) 
	 * @createDate 2013-3-12 下午02:12:43
	 * @since  1.0.0
	 */
	public abstract void executeMain();
	
	public void execute() {
		beforeAction();
		executeMain();
		afterAction();
	}
	
	public void beforeAction() {
		System.out.println("before Action...");
	}
	
	public void afterAction() {
		System.out.println("after Action...");
	}
}

/**
 * @Title:模版方法子類--實現其中可變的部分
 * @Description:TODO
 * @Company: Orclight's Studio
 * @author: shuzl  2013-3-12 下午02:13:09
 * @motto: Never put off what you can do today until Tomorrow
 * @version 1.0.0 
 */
public class TemplateImpl extends AbstractTemplate{
	public void executeMain() {
		System.out.println("核心操作處理...實現方式一");
	}
}

/**
 * @Title:模版方法測試類
 * @Description:TODO
 * @Company: Orclight's Studio
 * @author: shuzl  2013-3-12 下午02:14:18
 * @motto: Never put off what you can do today until Tomorrow
 * @version 1.0.0 
 */
public class TestTemplate {
	public static void main(String[] args) {
		AbstractTemplate temp = new TemplateImpl();
		temp.execute();
	}
}