给出下面程序的运行结果 class Demo{ int age; static int num=9; void speak(){ System.out.println(age); } } public class StaticDemo { public static void main(String[] args) { Demo d1=new Demo(); Demo d2=new Demo(); System.out.println(d1.num); d2.num=10; d2.age=5; System.out.println(d1.num); d2.speak(); } }