装饰模式

实验11：装饰模式

本次实验属于模仿型实验，通过本次实验学生将掌握以下内容： 

1、理解装饰模式的动机，掌握该模式的结构；

2、能够利用装饰模式解决实际问题。

 

[实验任务一]：手机功能的升级

用装饰模式模拟手机功能的升级过程：简单的手机(SimplePhone)在接收来电时，会发出声音提醒主人；而JarPhone除了声音还能振动；更高级的手机(ComplexPhone)除了声音、振动外，还有灯光闪烁提示。

实验要求：

1. 提交类图；

 

2.提交源代码；

 

// 基础手机接口  

public interface Phone {  

    void receiveCall();  

}  

 

// 简单手机实现  

public class SimplePhone implements Phone {  

    @Override  

    public void receiveCall() {  

        System.out.println("Receiving call: Sound alert");  

    }  

}  

 

// 装饰器基类  

public abstract class PhoneDecorator implements Phone {  

    protected Phone phone;  

 

    public PhoneDecorator(Phone phone) {  

        this.phone = phone;  

    }  

 

    @Override  

    public void receiveCall() {  

        if (phone != null) {  

            phone.receiveCall();  

        }  

    }  

}  

 

// 振动装饰器  

public class VibrationDecorator extends PhoneDecorator {  

    public VibrationDecorator(Phone phone) {  

        super(phone);  

    }  

 

    @Override  

    public void receiveCall() {  

        super.receiveCall();  

        vibrate();  

    }  

 

    private void vibrate() {  

        System.out.println("Vibration alert");  

    }  

}  

 

// 灯光装饰器  

public class LightDecorator extends PhoneDecorator {  

    public LightDecorator(Phone phone) {  

        super(phone);  

    }  

 

    @Override  

    public void receiveCall() {  

        super.receiveCall();  

        flashLight();  

    }  

 

    private void flashLight() {  

        System.out.println("Flashing light alert");  

    }  

}  

 

// 主方法测试  

public class Main {  

    public static void main(String[] args) {  

        Phone simplePhone = new SimplePhone();  

        simplePhone.receiveCall();  

 

        Phone jarPhone = new VibrationDecorator(simplePhone);  

        jarPhone.receiveCall();  

 

        Phone complexPhone = new LightDecorator(jarPhone);  

        complexPhone.receiveCall();  

    }  

}  

3.注意编程规范。