(7-1)以下程序运行结果是( )。 class FatherX{ public Integer getX() { return new Integer(10); } } class Son extends FatherX{ public Double getX() { return new Double(20); } } public class Demo12 { public static void main(String[] args ) { FatherX f = new FatherX(); Son s = new Son(); System. out .println( f .getX()+ s .getX()); } }