（7-1）请阅读下面程序，并写出运行结果。class Base{public int getX() {return 1;}public static int getY() {return 2;}}class Sub extends Base{public int getX() {return 3;}public static int getY() {return 4;}}public class Demo {public static void main(String[] args) {Sub sub=new Sub();Base base=(Base) sub;int a=sub.getX()*base.getX();int b=sub.getY() base.getY();System.out.println(a b);}}