【简答题】写出如下程序的输出结果 class A{ public int getNumber(int a) { return a + 1; } } class B extends A { public int getNumber (int a) { return a + 2; } public static void main (String args[]){ A a = new B(); System.o...
【简答题】写出如下程序的输出结果。 abstract class Shape { public abstract double area(); public void print() { System.out.println(this.area()); } } class Circle extends Shape { private double radius; public Circle(double r...