25.3、以下程序输出的结果为：abstract class Shape {     //定义抽象类Shape和抽象方法displayabstract void display();}class Circle extends Shape {void display() {//实现抽象类的方法System.out.println("Circle");}}class Rectangle extends Shape {void display() {    //实现抽象类的方法System.out.println("Rectangle");}}class Triangle extends Shape {void display() {  //实现抽象类的方法System.out.println("Triangle");}}public class AbstractClassDemo{public static void main(String args]){(new Circle()).display();//定义无名对象来调用对应的display方法(new Rectangle()).display();(new Triangle()).display();}}