Predicate in Java

Question

I am going through the code which uses Predicate in Java. I have never used Predicate. Can someone guide me to any tutorial or conceptual explanati

Answer 1

Adding up to what Micheal has said:

You can use Predicate as follows in filtering collections in java:

public static  Collection filter(final Collection target,
   final Predicate predicate) {
  final Collection result = new ArrayList();
  for (final T element : target) {
   if (predicate.apply(element)) {
    result.add(element);
   }
  }
  return result;
}

one possible predicate can be:

final Predicate filterCriteria = 
                    new Predicate() {
   public boolean apply(final DisplayFieldDto displayFieldDto) {
    return displayFieldDto.isDisplay();
   }
  };

Usage:

 final List filteredList=
 (List)filter(displayFieldsList, filterCriteria);