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Java-- 匿名类

2024-07-08 18:00:12   229人阅读

工厂方法

匿名类与正规的继承相比有些受限，因为匿名类既可以扩展类，也可以实现接口，但不能两者兼备。如果实现接口，也就只能实现一个接口。

 1 package innerclasses; 2  3  4 interface Service{ 5     void method1(); 6     void method2(); 7 } 8  9 interface ServiceFactory{10     Service getService();11 }12 13 class Implementation1 implements Service{14     private Implementation1(){}15     public void method1(){16         System.out.println("Implemention1 method1");17     }18     public void method2(){19         System.out.println("Implemention1 method1");20     }21     //下面是匿名类22     public static ServiceFactory factory = new ServiceFactory(){23         public Service getService(){24             return new Implementation1();25         }26     };27 }28 29 class Implementation2 implements Service{30     private Implementation2(){}31     public void method1(){32         System.out.println("Implemention2 method1");33     }34     public void method2(){35         System.out.println("Implemention2 method2");36     }37     38     public static ServiceFactory factory = new ServiceFactory(){39         public Service getService(){40             return new Implementation2();41         }42     };43 }44 45 public class Factories{46     public static void serviceConsumer(ServiceFactory fact){47         Service s = fact.getService();48         s.method1();49         s.method2();50     }51     public static void main(String [] args){52         serviceConsumer(Implementation1.factory);53         serviceConsumer(Implementation2.factory);54     }55 }
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结果：

Implemention1 method1Implemention1 method1Implemention2 method1Implemention2 method2

 


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