装饰模式

Posted 2020-07-01 仙人掌的刺

装饰模式将类的装饰功能从类中分离出来，只保留了类的核心职责，装饰逻辑（顺序）由调用者选择分配。

/**
 * Created by hero on 16-3-30.
 */
public abstract class Person {
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Person() {
    }

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

    public abstract void show();
}
/**
 * Created by hero on 16-3-30.
 */
public class Finery extends Person {
    protected Person person;

    public void Decorate(Person person) {
        this.person = person;
    }

    @Override
    public void show() {
        if (this.person != null) {
            person.show();
        }
    }
}
/**
 * Created by hero on 16-3-30.
 */
public class TShirt extends Finery {
    public void show() {
        super.show();
        System.out.println("T-shirt");
    }
}
/**
 * Created by hero on 16-3-30.
 */
public class Trouser extends Finery {
    public void show() {
        super.show();
        System.out.println("Trouser");
    }
}
/**
 * Created by hero on 16-3-30.
 */
public class ConcretePerson extends Person {
    public ConcretePerson(String name) {
        setName(name);
    }

    @Override
    public void show() {
        System.out.println(getName());
    }
}
public class Main {

    public static void main(String[] args) {
        ConcretePerson person = new ConcretePerson("小明");
        TShirt tShirt = new TShirt();
        Trouser trouser = new Trouser();
        tShirt.Decorate(person);
        trouser.Decorate(tShirt);
        trouser.show();
    }
}