Java装饰模式
装饰模式:给一个类添加一些额外的职责,并且在添加这些额外的职责时不会控制该类的执行逻辑。
UML类图:
组成部分:
抽象构件:原始的功能接口
具体构件:具体的原始功能类
装饰角色:持有具体构件类的对象,以便执行原有功能
具体装饰:具体扩展的功能在这里
下面看一个人物功能拓展的实例(姓名+爱好):
package com.dashu.decorator;
/**
* 抽象接口类
* */
public interface Component {
public void operation();
}
package com.dashu.decorator;
/**
* 具体构建
* */
public class ConcreteComponent implements Component {
public ConcreteComponent() {
}
@Override
public void operation() {
// TODO Auto-generated method stub
System.out.println("我的名字叫大树!");
}
}
package com.dashu.decorator;
/**
* 装饰角色,持有一个构件(Component)对象的实例,并定义一个与抽象构件接口一致的接口
* */
public class Decorator implements Component {
private Component component;
public Decorator(Component component) {
ponent = component;
}
@Override
public void operation() {
// TODO Auto-generated method stub
component.operation();
}
}
package com.dashu.decorator;
public class ConcreteDecorator extends Decorator {
public ConcreteDecorator(Component component) {
super(component);
}
@Override
public void operation() {
// TODO Auto-generated method stub
super.operation();
this.addedOperation();
}
public void addedOperation() {
System.out.println("我爱好是编程!");
}
}
package com.dashu.client;
import com.ponent;
import com.dashu.decorator.ConcreteComponent;
import com.dashu.decorator.ConcreteDecorator;
import com.dashu.decorator.Decorator;
public class Client {
public static void main(String[] args) {
Component component=new ConcreteComponent();
Decorator decorator =new ConcreteDecorator(component);
//客户端不变,但是已经添加了职责
decorator.operation();
}
}
原文:/u010794950/article/details/26157899
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