设计模式-结构型-装饰模式

1、定义

装饰模式：动态给对象添加新功能

写法

public abstract class Person {

    public abstract void dressed();

}

public class Girl extends Person {
    @Override
    public void dressed() {
        System.out.println("Girl穿了打底裤");
    }
}

public class PersonWrapper extends Person{

    private Person mPerson;

    public PersonWrapper(Person mPerson) {
        this.mPerson = mPerson;
    }

    @Override
    public void dressed() {
        mPerson.dressed();
    }

}

public class PersonClothSytle extends PersonWrapper{

    public PersonClothSytle(Person mPerson) {
        super( mPerson );
    }

    /**
     * 穿牛仔裤
     */
    private void dressJean(){
        System.out.println("穿牛仔裤");
    }

    /**
     * 穿鞋子
     */
    private void dressShoes(){
        System.out.println("穿鞋子 ");
    }

    @Override
    public void dressed() {
        super.dressed();
        dressJean();
        dressShoes();
    }
}

public class TestMain {
    
    /**
     * 装饰模式
     * 层层给装饰方法添加新内容
     * eg context contextwrapper
     * 装饰模式比继承更加灵活性
     * @param args
     */
    public static void main(String[] args) {

        Person girl = new Girl();

        PersonWrapper wrapper = new PersonWrapper( girl );
        wrapper.dressed();

        PersonWrapper style = new PersonClothSytle( girl );
        style.dressed();

    }

}

代码示例

https://github.com/yinlingchaoliu/23-design-pattern