第6章 穿什么有这么重要？——装饰模式（Java）

学习模式要善于变通，如果只有一个ConcreteComponent类而没有抽象的Component类，那么Decorator类可以是ConcreteComponent的一个子类。
同样道理，如果只有一个ConcreteDecorator类，那么就没有必要建立一个单独的Decorator类，只保留一个ConcreteDecorator类即可。
在这里我们就没必要有Component类了，直接让服饰类Decorator继承人类ConcreteComponent就可。

/**
 * @CreateTime: 2021/02/17 12:13
 * @Description: 装饰模式：人穿衣服
 */
public class PersonDecorator {
    private String name;

    public static void main(String[] args) {
        PersonDecorator pd = new PersonDecorator("小菜");

        // 1、普通方式
//        System.out.println("\n第一种装扮：");
//        pd.wearTShirts();
//        pd.wearTrouser();
//        pd.wearSneakers();
//        pd.show();
//
//        System.out.println("\n第二种装扮：");
//        pd.wearSuit();
//        pd.wearTie();
//        pd.wearLeatherShoes();
//        pd.show();

        // 2、继承
//        System.out.println("\n第一种装扮：");
//        Finery shirts = new TShirts();
//        Finery trouser = new Trouser();
//        Finery sneakers = new Sneakers();
//
//        shirts.show();
//        trouser.show();
//        sneakers.show();
//        pd.show();
//
//        System.out.println("\n第二种装扮：");
//        Finery suit = new Suit();
//        Finery tie = new Tie();
//        Finery shoes = new LeatherShoes();
//
//        suit.show();
//        tie.show();
//        shoes.show();
//        pd.show();

        // 3、装饰模式
        Person person = new Person("小菜");

        System.out.println("\n第一种装扮：");
        Finery shirts = new TShirts();
        Finery trouser = new Trouser();
        Finery sneakers = new Sneakers();

        // 装饰过程
        shirts.decorate(person);
        trouser.decorate(shirts);
        sneakers.decorate(trouser);
        sneakers.show();

        System.out.println("\n第二种装扮：");
        Finery suit = new Suit();
        Finery tie = new Tie();
        Finery shoes = new LeatherShoes();

        suit.decorate(person);
        tie.decorate(suit);
        shoes.decorate(tie);
        shoes.show();
    }

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

    public void wearTShirts() {
        System.out.print("T恤 ");
    }

    public void wearTrouser() {
        System.out.print("垮裤 ");
    }

    public void wearSneakers() {
        System.out.print("破球鞋 ");
    }

    public void wearSuit() {
        System.out.print("西装 ");
    }

    public void wearTie() {
        System.out.print("领带 ");
    }

    public void wearLeatherShoes() {
        System.out.print("皮鞋 ");
    }

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

/** ConcreteComponent */
class Person {
    public Person() {    }

    private String name = "";

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

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

/** Decorator */
class Finery extends Person {
    private Person component = null;

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

    /** 服饰展示 */
    @Override
    public void show() {
        if (component != null) {
            component.show();
        }
    }
}

class TShirts extends Finery {
    @Override
    public void show() {
        System.out.print("T恤 ");
        super.show();
    }
}

class Trouser extends Finery {
    @Override
    public void show() {
        System.out.print("垮裤 ");
        super.show();
    }
}

class Sneakers extends Finery {
    @Override
    public void show() {
        System.out.print("破球鞋 ");
        super.show();
    }
}

class Suit extends Finery {
    @Override
    public void show() {
        System.out.print("西装 ");
        super.show();
    }
}

class Tie extends Finery {
    @Override
    public void show() {
        System.out.print("领带 ");
        super.show();
    }
}

class LeatherShoes extends Finery {
    @Override
    public void show() {
        System.out.print("皮鞋 ");
        super.show();
    }
}