抽象类或接口 通过匿名内部类 进行实现，
abstract class Person { public abstract void eat();}public class Demo { public static void main(String[] args) { Person p = new Person() { public void eat() { System.out.println("eat something"); } }; p.eat(); }}interface Person { public void eat();}public class Demo { public static void main(String[] args) { Person p = new Person() { public void eat() { System.out.println("eat something"); } }; p.eat(); }}原文：http://www.cnblogs.com/tcdxx/p/6181471.html