org.apache.commons.collections4

## Interface Unmodifiable

- All Known Implementing Classes:
    UnmodifiableBag, UnmodifiableBidiMap, UnmodifiableBoundedCollection, UnmodifiableCollection, UnmodifiableEntrySet, UnmodifiableIterator, UnmodifiableList, UnmodifiableListIterator, UnmodifiableMap, UnmodifiableMapEntry, UnmodifiableMapIterator, UnmodifiableMultiSet, UnmodifiableMultiValuedMap, UnmodifiableNavigableSet, UnmodifiableOrderedBidiMap, UnmodifiableOrderedMap, UnmodifiableOrderedMapIterator, UnmodifiableQueue, UnmodifiableSet, UnmodifiableSortedBag, UnmodifiableSortedBidiMap, UnmodifiableSortedMap, UnmodifiableSortedSet, UnmodifiableTrie

      public interface Unmodifiable

  Marker interface for collections, maps and iterators that are unmodifiable.

  This interface enables testing such as:

       if (coll instanceof Unmodifiable) {
         coll = new ArrayList(coll);
       }
       // now we know coll is modifiable

  Of course all this only works if you use the Unmodifiable classes defined in this library. If you use the JDK unmodifiable class via `java.util Collections` then the interface won't be there.
  Since:
    3.0

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