标签：add 一段 一个 pre desc pack att turn 装饰器
装饰器模式：动态地将责任附加到对象上，允许用户向现有对象添加新功能而不改变其结构。若要扩展功能，装饰器提供了比继承更有弹性的替代方案。
场景：假如有这样一个抽象装备类
package pattern.decorator; public abstract class Equipment { int power;//战斗力 String desc = "";//介绍 public String getDesc(){ return desc; } //获取战斗力 public abstract int getPower(); }
然后实现一个武器类继承上面的装备类
package pattern.decorator; public class Weapon extends Equipment { public Weapon(){ desc = "屠龙宝刀"; power = 1000000; } @Override public int getPower() { return power; } }
一段时间后，装备增加了进阶，时装，强化等功能，这些功能都可以提升战斗力，现在希望计算提升后的战斗力。
先不管其他方法是怎么实现这个需求的，让我们来看看装饰器模式是怎么设计的，并且不会改变上面的Weapon类。
首先，设计一个装备的装饰器抽象类
package pattern.decorator; public abstract class Decorator extends Equipment { //显示都装饰了什么 public abstract String getDesc(); }
然后实现强化，进阶，时装的装饰类
强化（强化一次战力提升1000）：
package pattern.decorator; public class StrengthDecorator extends Decorator { Equipment equipment;//需要被装饰的装备 int strength = 0;//强化了多少 public StrengthDecorator(Equipment equipment,int strength){ this.equipment = equipment; this.strength = strength; } @Override public String getDesc() { return "强化了"+strength+"次"+","+equipment.getDesc(); } @Override public int getPower() { return equipment.getPower() + 1000*strength; } }
进阶（进阶一次战力提升2000）：
package pattern.decorator; public class AdvanceDecorator extends Decorator { Equipment equipment;//需要被装饰的装备 int advance = 0;//进阶了多少 public AdvanceDecorator(Equipment equipment, int advance){ this.equipment = equipment; this.advance = advance; } @Override public String getDesc() { return "进阶了"+advance+"次"+","+equipment.getDesc(); } @Override public int getPower() { return equipment.getPower() + 2000*advance; } }
时装（根据不同的时装提升战力）：
package pattern.decorator; public class FactionDecorator extends Decorator { Equipment equipment;//需要被装饰的装备 String faction = "";//进阶了多少 int add = 0; public FactionDecorator(Equipment equipment, int faction){ this.equipment = equipment; if(faction==1){ this.faction = "春节时装"; add = 5000; }else{ this.faction = "普通时装"; add = 2500; } } @Override public String getDesc() { return faction+","+equipment.getDesc(); } @Override public int getPower() { return equipment.getPower() + add; } }
最后实现个测试类看看装饰器模式是怎么运作的
package pattern.decorator;
public class ShowController {
public static void main(String[] args) {
Equipment weapon = new Weapon();
System.out.println(weapon.getDesc()+",战力:"+weapon.getPower());
weapon = new AdvanceDecorator(weapon,10);
System.out.println(weapon.getDesc()+",战力:"+weapon.getPower());
weapon = new FactionDecorator(weapon,1);
System.out.println(weapon.getDesc()+",战力:"+weapon.getPower());
weapon = new StrengthDecorator(weapon,15);
System.out.println(weapon.getDesc()+",战力:"+weapon.getPower());
}
}
运行结果：
屠龙宝刀,战力:1000000
进阶了10次,屠龙宝刀,战力:1020000
春节时装,进阶了10次,屠龙宝刀,战力:1025000
强化了15次,春节时装,进阶了10次,屠龙宝刀,战力:1040000
标签：add 一段 一个 pre desc pack att turn 装饰器
原文地址：https://www.cnblogs.com/yzdtofly/p/9449355.html
