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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class AbstractClass {
  9.  
  10.     abstract class Vessel {
  11.         double contents;
  12.         abstract double capacity();
  13.         void fill(double amount) {
  14.             contents = Math.min(contents + amount, capacity());
  15.         }
  16.     }
  17.  
  18.     class Tank extends Vessel {
  19.  
  20.         double length, width, height;
  21.  
  22.         Tank(double length, double width, double height) {
  23.             this.length = length;
  24.             this.width = width;
  25.             this.height = height;
  26.         }
  27.  
  28.         double capacity() {
  29.             return length * width * height;
  30.         }
  31.  
  32.         public String toString() {
  33.             return "tank (" + length + ", " + width + ", " + height + ")";
  34.         }
  35.     }
  36.  
  37.     class Cube extends Tank {
  38.  
  39.         Cube(double side) {
  40.             super(side, side, side);
  41.         }
  42.  
  43.         public String toString() {
  44.             return "cube (" + length + ")";
  45.         }
  46.     }
  47.  
  48.     class Barrel extends Vessel {
  49.         double radius, height;
  50.  
  51.         Barrel(double radius, double height) {
  52.             this.radius = radius;
  53.             this.height = height;
  54.         }
  55.  
  56.         double capacity() {
  57.             return height * Math.PI * radius * radius;
  58.         }
  59.  
  60.         public String toString() {
  61.             return "barrel (" + radius + ", " + height + ")";
  62.         }
  63.     }
  64. }
Compilation error #stdin compilation error #stdout 0.04s 4386816KB
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stdin
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Standard input is empty
compilation info 
spoj: The program compiled successfully, but main class was not found.
      Main class should contain method: public static void main (String[] args).
stdout
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Standard output is empty
https://ideone.com/RGU498
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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