三：装饰者模式

装饰者模式：通过组合对已有代码进行装饰。根据不同功能拆分装饰器，装饰器可以装饰一类对象，同一个对象可以被不同的装饰器装饰，使用时自由组合装饰器与实例得到不同的结果

public abstract class People {

    public abstract void cry();
}

public class Man extends People {
    @Override
    public void cry() {
        System.out.print(" 男孩：呜呜呜呜～");
    }
}

public class Woman extends People {
    @Override
    public void cry() {
        System.out.print(" 女孩：啊啊啊啊～");
    }
}

public class SobbingCryDecorator {

    private People people;

    public void cry() {
        System.out.print("小声啜泣，发出～～～");

        people.cry();

        System.out.println("的声音");
    }


    public void setPeople(People people) {
        this.people = people;
    }
}

public class NoiseCryDecorator {

    private People people;

    public void cry() {
        System.out.print("大声喧哗，发出～～～");

        people.cry();

        System.out.println("的声音");
    }


    public void setPeople(People people) {
        this.people = people;
    }
}

public class TestDemo {
    public static void main(String[] args) {
        People man = new Man();
        People woman = new Woman();
        NoiseCryDecorator noiseCryDecorator = new NoiseCryDecorator();

        SobbingCryDecorator sobbingCryDecorator = new SobbingCryDecorator();

        //男孩子吵闹
        noiseCryDecorator.setPeople(man);
        noiseCryDecorator.cry();

        //女孩子委屈
        sobbingCryDecorator.setPeople(woman);
        sobbingCryDecorator.cry();

        //男孩子委屈
        sobbingCryDecorator.setPeople(man);
        sobbingCryDecorator.cry();

    }
}