Java设计模式之Strategy模式

基于有了oo的基础后，开始认真学习设计模式！设计模式是java设计中必不可少的！

apple.java

package strategy;
/**
 * 
 * @author andy
 *
 */
 
public class apple implements discountable {
  //重量
  private double weight;
  //单价 实际开发中 设计金钱等精确计算都是bigdecimal;
    private double price;
    //按购买量打折
  // private discountor d = new appleweightdiscountor();
    //按购买总价打折
    private discountor d = new applepricediscountor();
     
  public double getweight() {
    return weight;
  }
   
  public void setweight(double weight) {
    this.weight = weight;
  }
   
  public double getprice() {
    return price;
  }
   
  public void setprice(double price) {
    this.price = price;
  }

  public apple (double weight,double price ){
   
    super();
    this.weight=weight;
    this.price=price;
  }
 
  @override
  public void discountsell() {
     d.discount(this);
  }  
}

banana.java

package strategy;
/**
 * 
 * @author andy
 *
 */
public class banana implements discountable {
  //重量
  private double weight;
////单价 实际开发中 涉及金钱等精确计算都是用bigdecimal
  private double price;
   
  public banana(double weight, double price) {
    super();
    this.weight = weight;
    this.price = price;
  }
 
  public double getweight() {
    return weight;
  }
   
  public void setweight(double weight) {
    this.weight = weight;
  }
   
  public double getprice() {
    return price;
  }
   
  public void setprice(double price) {
    this.price = price;
  }
 
  @override
  public void discountsell() {
    //打折算法
    if(weight < 5) {
      system.out.println("banana未打折价钱: " + weight * price);
    }else if(weight >= 5 && weight < 10) {
      system.out.println("banana打八八折价钱: " + weight * price * 0.88 );
    }else if(weight >= 10) {
      system.out.println("banana打五折价钱: " + weight * price * 0.5 );
    }    
     
  }

}

market.java

package strategy;
/**
 * 
 * @author andy
 *
 */
public class market {
   
  /**
   * 对可打折的一类事物进行打折
   * @param apple
   */

  public static void discountsell(discountable d) {
    d.discountsell();

}
}

discountable.java

package strategy;
/**
 * 
 * @author andy
 *
 */
public interface discountable {
  public void discountsell();
}

test.java

package strategy;
/**
 * 
 * @author andy
 *
 */
public class test {
   
  /**
   * 
   * @param args
   */
 
  public static void main(string[] args) {
//    只能对苹果打折 还不能对通用的一类事物打折 而且都是要卖什么就写什么打折算法 
//   其实每类事物打折算法又是不一致的
    discountable d = new apple(10.3, 3.6);
    discountable d1= new banana(5.4,1.1);
      market.discountsell(d);
      market.discountsell(d1);
     
 
  }
 
}