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;
3.注意编程规范。
1.
.
2.// 抽象手机组件
abstract class Phone {
protected Component component;
public Phone(Component component) {
this.component = component;
}
public abstract void ring();
}
// 具体手机组件
class SimplePhone extends Phone {
public SimplePhone(Component component) {
super(component);
}
@Override
public void ring() {
System.out.println("SimplePhone: Ringing...");
}
}
// 抽象装饰者
abstract class Decorator extends Phone {
public Decorator(Component component) {
super(component);
}
@Override
public void ring() {
component.ring();
}
}
// 具体装饰者1:振动功能
class VibrateDecorator extends Decorator {
public VibrateDecorator(Component component) {
super(component);
}
@Override
public void ring() {
super.ring();
System.out.println("VibrateDecorator: Vibrating...");
}
}
// 具体装饰者2:闪光灯功能
class FlashDecorator extends Decorator {
public FlashDecorator(Component component) {
super(component);
}
@Override
public void ring() {
super.ring();
System.out.println("FlashDecorator: Flashing...");
}
}
// 客户端代码
public class DecoratorPatternDemo {
public static void main(String[] args) {
Component simplePhone = new SimplePhone(null);
simplePhone.ring(); // SimplePhone: Ringing...
Component jarPhone = new VibrateDecorator(simplePhone);
jarPhone.ring(); // SimplePhone: Ringing... + VibrateDecorator: Vibrating...
Component complexPhone = new FlashDecorator(new VibrateDecorator(simplePhone));
complexPhone.ring(); // SimplePhone: Ringing... + VibrateDecorator: Vibrating... + FlashDecorator: Flashing...
}
}