装饰器模式（Decorator Pattern）允许向一个现有的对象添加新的功能，同时又不改变其结构。这种类型的设计模式属于结构型模式，它是作为现有的类的一个包装。

public interface Hero {
    //学习技能
    void learnSkills();
}
public class BlindMonk implements Hero {
    
    private String name;
    
    public BlindMonk(String name) {
        this.name = name;
    }

    @Override
    public void learnSkills() {
        System.out.println(name + "学习了以上技能！");
    }
}
//Decorator 技能栏
public class Skills implements Hero{
    
    //持有一个英雄对象接口
    private Hero hero;
    
    public Skills(Hero hero) {
        this.hero = hero;
    }

    @Override
    public void learnSkills() {
        if(hero != null)
            hero.learnSkills();
    }    
}
//ConreteDecorator 技能：Q
public class Skill_Q extends Skills{
    
    private String skillName;

    public Skill_Q(Hero hero,String skillName) {
        super(hero);
        this.skillName = skillName;
    }

    @Override
    public void learnSkills() {
        System.out.println("学习了技能Q:" +skillName);
        super.learnSkills();
    }
}