(7-12)请阅读程序,写出程序运行结果。 class A{ static String name = "tom" ; static int getX() { return 2; } int getY() { return 3; } } class B extends A{ static String name = "Tuny" ; static int getX() { return 4; } int getY() { return 5; } } class C extends A{ static String name = "Tuny" ; static int getX() { return 4; } int getY() { return 5; } } interface D{ int getY(); } class E implements D{ public int getY() { return 6; } } public class Demo{ public static void main(String[] args ) { A a = new A(); A b = new B(); A c = new C(); D d = new E(); int sum = a . name .length()+ b . getX ()+ c .getY()+ d .getY(); System. out .println( sum ); } }