软件设计之装饰模式

news2024/11/25 12:33:54

装饰模式把每个要装饰的功能放在单独的类中，并让这个类包装它所要装饰的对象，因此，当需要执行特殊行为时，客户代码就可以在运行时根据需要有选择地、按顺序地使用装饰功能包装对象。

案例：穿搭。衣柜有帽子、眼镜、冲锋衣和毛衣，现在请你选择一件或多件物品穿搭出门。使用装饰模式打印出不同的方案。

package Decorator;

public class Cap extends Finary{
    @Override
    public void show() {
        System.out.print("帽子 ");
        super.show();
    }
}

package Decorator;

public class Finary extends Person{
    private  Person component;

    public void decorate(Person component) {
        this.component = component;
    }

    @Override
    public void show() {
        if(component!=null) {
            component.show();
        };
    }
}

package Decorator;

public class Glasses extends Finary{
    @Override
    public void show() {
        System.out.print("眼镜 ");
        super.show();
    }
}

package Decorator;

public class OutdoorJacket extends Finary{
    @Override
    public void show() {
        System.out.print("冲锋衣 ");
        super.show();
    }
}

package Decorator;

public class Person {
    private String name;

    public Person() {

    }

    public Person(String name) {
        this.name = name;
    }

    public void show() {
        System.out.println("(" + name + ")");;
    }
}

package Decorator;

public class Sweater extends Finary{
    @Override
    public void show() {
        System.out.print("毛衣 ");
        super.show();
    }
}

package Decorator;

public class Client {
    public static void main(String[] args) {
        Person z = new Person("张三");
        Cap cap = new Cap();
        Glasses glasses = new Glasses();
        OutdoorJacket oj = new OutdoorJacket();
        cap.decorate(z);
        glasses.decorate(cap);
        oj.decorate(glasses);
        oj.show();

        Person l = new Person("李四");
        Sweater sweater = new Sweater();
        sweater.decorate(l);
        sweater.show();

    }
}