根据程序,写运行结果。 class Point { private int x,y; public Point() { x=0; y=0; System.out.println(" Point Default Constructor "); } public Point(int a,int b) { x=a; y=b; System.out.println("Point Constructor "); } public void show() { System.out.print("("+x+","+y+")"); } } class Circle extends Point { private int r; public Circle(int a,int b,int r1) { super(a,b); r=r1; System.out.println("Circle Constructor "); } public Circle() { r=1; System.out.println(" Circle Default Constructor "); } public void show() { super.show(); System.out.println(" r="+r); } public static void main(String[] args) { Circle c=new Circle(2,2,5); c.show(); Circle c2=new Circle(); } }