use of isAssignableFrom

Instead of

 @Override
 public boolean equals(Object obj)
 {
  if (this == obj) return true;
  if (obj == null) return false;
  if (getClass() != obj.getClass()) return false;
  final Location other = (Location) obj;
  if (getId() != other.getId()) return false;
  return true;
 }

use

 @Override
 public boolean equals(Object obj)
 {
  if (this == obj) return true;
  if (obj == null) return false;
  if (! getClass().isAssignableFrom( obj.getClass() ) ) return false;
  final Location other = (Location) obj;
  if (getId() != other.getId()) return false;
  return true;
 }

Ref: http://docs.oracle.com/javase/1.4.2/docs/api/java/lang/Class.html#isAssignableFrom(java.lang.Class)