请教各位大神，最后输出为何是零？
如图。请教一下各位，为何最后输入信息之后，输出的值始终为零呢？
4 回答
public abstract class Shape {
public double C;
public double S;
public abstract void Perimeter();
public abstract void Area();
}public class Circle extends Shape{
double R;
final double PI = 3.14;
Circle(double RR){
this.R = RR;
}
public void Perimeter(){
C = 2 * PI * R;
System.out.println("圆形的周长为" + C);
}
public void Area(){
S = PI * R * R;
System.out.println("圆形的面积为" + S);
}
}public class Rectangle extends Shape{
double l;
double d;
Rectangle(double ll, double dd){
this.l = ll;
this.d = dd;
}
public void Perimeter(){
C = 2 * (l + d);
System.out.println("矩形的周长为" + C);
}
public void Area(){
S = l * d;
System.out.println("矩形的面积为" + S);
}
}import java.util.Scanner;
public class Test {
public static void main(String[] args){
Scanner input = new Scanner(System.in);
System.out.println("请输入矩形的长和宽");
double l = input.nextDouble();
double d = input.nextDouble();
Shape sp1 = new Rectangle(l, d);
sp1.Perimeter();
sp1.Area();
System.out.println("请输入圆形的半径");
double r = input.nextDouble();
Shape sp2 = new Circle(r);
sp2.Perimeter();
sp2.Area();
}
}请输入矩形的长和宽
2
2
矩形的周长为8.0
矩形的面积为4.0
请输入圆形的半径
2
圆形的周长为12.56
圆形的面积为12.56
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