/*  計算長方體體積   */ 
   import javax.swing.*;
   class Box
   { 
      double volume(double width,double height,double depth)       
		{ 
           return width * height * depth; 
        } 
    } 
   public class Example3_5
     { 
       public static void main(String args[])
		 { 
           Box box = new Box(); 
           double v; 
           v = box.volume(3,4,5); 
		   JOptionPane.showMessageDialog(null,"長方體體積＝"+v);
		     System.exit(0);
         } 
    }