lengthcomparer.java

Java程序设计技巧与开发实例附书源代码。

public class LengthComparer
    implements Comparable
{
   public int compare(Object obj1, Object obj2)
   {
      if ( (obj1 instanceof Length) && (obj2 instanceof Length))
      {
         Length length1 = ( (Length) obj1).convertToMeter();
         Length length2 = ( (Length) obj2).convertToMeter();
         if (length1.getValue() < length2.getValue())
         {
            return -1;
         }
         else if (length1.getValue() == length2.getValue())
         {
            return 0;
         }
         else
         {
            return 1;
         }
      }
      else
      {
         return -1;
      }
   }
}