circleclassaa.java

刘艺编著的java教程的课本习题加例题代码 很有用哦！

public class CircleClassaa {
     public static void main(String args[]){
                
         double v_Circle;
         double s_Circle;
         double radius=4; 
         s_Circle=area(radius);
         v_Circle=volume(radius); 
         System.out.println("V="+v_Circle);
         System.out.println("S="+s_Circle);
     }

     public static double area(double r1) {
    
        double s=3.14*r1*r1;
        return s;
     }

     public static double volume(double r2) { 
    
        double v=3*3.14*r2*r2*r2/4; 
        return v;
     }
}