阅读下面程序，写出程序运行结果：

【填空题】读下面程序,写出程序运行结果。 class Father { int num1=0; public Father(){ System.out.println("num1:"+num1);} public Father(int num1){ this.num1=num1; System.out.println("num1:"+num1); } } class Son extends Father{ int num2=10; public Son(){System.out.println("num2:"+num2);} public Son(int i,int j){ super(i); num2=j; System.out.println( "num1:"+num1+",num2:"+num2); } } public class Demo{ public static void main(String []args){ Father father=new Father(); Son son=new Son(); Son son1=new Son(20,30); } } 运行结果为:

【填空题】读下面程序,写出程序运行结果。 abstract class Graph{ int a; public Graph(){a=1;} public Graph(int a){this.a=a; } public abstract void showArea(); } class Rect extends Graph{ int b; public Rect(int a,int b){super(a); this.b= b; } public void showArea(){ System.out.println("Area:"+(a*b));} } class Circle extends Graph{ public Circle(){}; public Circle(int a){super(a);} public void showArea(){ System.out.println("Area:"+(3.14*a*a)); } } public class classDemo1{ public static void main(String []args){ Graph g1; g1=new Rect(2,3); g1.showArea(); g1=new Circle(2); g1.showArea(); g1= new Circle(); g1.showArea(); } } 运行结果为:

【填空题】读下面程序,写出程序运行结果。 class Point{ int x; public Point(){x=0;} public Point(int x){this.x=x;} public void show(){System.out.println(x);}} class SPoint extends Point{ int y; public SPoint(){y=0;} public SPoint(int x,int y){super(x); this.y=y;} public void show(){System.out.println(x+","+y);}} public class tempDemo{ public static void main(String []args){ Point p=new Point(); p.show(); Point p1=new Point(2); p1.show(); SPoint sp=new SPoint(); sp.show(); SPoint sp1=new SPoint(2,3); sp1.show(); }} 运行结果为:

阅读下面的程序，写出程序的运行结果_______ #include <stdio.h> int main() { int i,j; i=010; j=9; printf("%d,%d",i-j,i+j); }

blic 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); } }