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