src/Size.java

   1 public class Size implements Comparable<Size> {
   2     private int max = 240;
   3     private int min = 20;
   4     private int size;
   5
   6     Size() {
   7     }
   8
   9     Size(int size) {
  10         setSize(size);
  11     }
  12
  13     public int getSize() {
  14         return size;
  15     }
  16
  17     public void setSize(int size) {
  18         if (validateSize(size)) {
  19             this.size = size;
  20         } else {
  21             throw new IllegalArgumentException("Size must be between " + this.min + " and " + this.max);
  22         }
  23     }
  24
  25     private boolean validateSize(int size) {
  26         return (size >= min && size <= max);
  27     }
  28
  29     @Override
  30     public int compareTo(Size size) {
  31         int distance = size.getSize() - this.getSize();
  32         if (distance >= 0)
  33             return distance;
  34         else
  35             return -distance;
  36
  37     }
  38 }