Reverse Comparator

+ static class ReverseComparator implements Comparator, Serializable
+ {
+ public int compare(Object a, Object b)
+ {
+ return -((Comparable) a).compareTo(b);
+ }
+ }
+
+ static ReverseComparator rcInstance = new ReverseComparator();
+
/**
* Get a comparator that implements the reverse of natural ordering. This is
* intended to make it easy to sort into reverse order, by simply passing
* Collections.reverseOrder() to the sort method. The return value of this
* method is Serializable.
*/
- // The return value isn't Serializable, because the spec is broken.
public static Comparator reverseOrder()
{
- return new Comparator()
- {
- public int compare(Object a, Object b)
- {
- return -((Comparable) a).compareTo(b);
- }
- };
+ return rcInstance;
}