Class UnmodifiableCollection<E>

  • Type Parameters:
    E - the type of the elements in the collection
    All Implemented Interfaces:
    java.io.Serializable, java.lang.Iterable<E>, java.util.Collection<E>, Unmodifiable

    public final class UnmodifiableCollection<E>
    extends AbstractCollectionDecorator<E>
    implements Unmodifiable
    Decorates another Collection to ensure it can't be altered.

    This class is Serializable from Commons Collections 3.1.

    Attempts to modify it will result in an UnsupportedOperationException.

    Since:
    3.0
    See Also:
    Serialized Form
    • Method Detail

      • unmodifiableCollection

        public static <T> java.util.Collection<T> unmodifiableCollection​(java.util.Collection<? extends T> coll)
        Factory method to create an unmodifiable collection.

        If the collection passed in is already unmodifiable, it is returned.

        Type Parameters:
        T - the type of the elements in the collection
        Parameters:
        coll - the collection to decorate, must not be null
        Returns:
        an unmodifiable collection
        Throws:
        java.lang.NullPointerException - if collection is null
        Since:
        4.0
      • iterator

        public java.util.Iterator<Eiterator()
        Specified by:
        iterator in interface java.util.Collection<E>
        Specified by:
        iterator in interface java.lang.Iterable<E>
        Overrides:
        iterator in class AbstractCollectionDecorator<E>