软件设计-装饰器模式

public class 装饰器模式 {
    public static void main(String[] args)
    {
        //第一种写法
        Person person=new Student("张三");
        person.Operation();
        System.out.println();

        person =new DecoratorA(person);
        person.Operation();
        System.out.println();

        person =new DecoratorB(person);
        person.Operation();
        System.out.println();

        //第二种写法     对象链
        Person lisi=new DecoratorA(new Student("李四"));
        lisi.Operation();
    }
}
abstract class Person{
    protected String name;
    public abstract void Operation();
}
class Student extends Person{
    Student(String name)
    {
        this.name=name;
    }
    @Override
    public void Operation()
    {
        System.out.print(name);
    }
}
abstract class Decorator extends Person{
    protected Person person;
}
class DecoratorA extends Decorator{
    public DecoratorA(Person person)
    {
        this.person=person;
    }
    @Override
    public void Operation()
    {
        person.Operation();
        System.out.print("写作业");
    }
}
class DecoratorB extends Decorator{
    public DecoratorB(Person person)
    {
        this.person=person;
    }
    @Override
    public void Operation()
    {
        person.Operation();
        System.out.println("考满分");
    }
}

运行结果