Class UnmodifiableQueue<E>
java.lang.Object
org.apache.commons.collections4.collection.AbstractCollectionDecorator<E>
org.apache.commons.collections4.queue.AbstractQueueDecorator<E>
org.apache.commons.collections4.queue.UnmodifiableQueue<E>
- Type Parameters:
E- the type of elements held in this queue
- All Implemented Interfaces:
Serializable,Iterable<E>,Collection<E>,Queue<E>,Unmodifiable
Decorates another
Queue to ensure it can't be altered.
Attempts to modify it will result in an UnsupportedOperationException.
- Since:
- 4.0
- See Also:
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Method Summary
Modifier and TypeMethodDescriptionbooleanbooleanaddAll(Collection<? extends E> coll) voidclear()iterator()booleanpoll()remove()booleanbooleanremoveAll(Collection<?> coll) booleanbooleanretainAll(Collection<?> coll) static <E> Queue<E> unmodifiableQueue(Queue<? extends E> queue) Factory method to create an unmodifiable queue.Methods inherited from class org.apache.commons.collections4.queue.AbstractQueueDecorator
decorated, element, peekMethods inherited from class org.apache.commons.collections4.collection.AbstractCollectionDecorator
contains, containsAll, isEmpty, setCollection, size, toArray, toArray, toStringMethods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitMethods inherited from interface java.util.Collection
contains, containsAll, equals, hashCode, isEmpty, parallelStream, size, spliterator, stream, toArray, toArray
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Method Details
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unmodifiableQueue
Factory method to create an unmodifiable queue.If the queue passed in is already unmodifiable, it is returned.
- Type Parameters:
E- the type of the elements in the queue- Parameters:
queue- the queue to decorate, must not be null- Returns:
- an unmodifiable Queue
- Throws:
NullPointerException- if queue is null
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add
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addAll
- Specified by:
addAllin interfaceCollection<E>- Overrides:
addAllin classAbstractCollectionDecorator<E>
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clear
- Specified by:
clearin interfaceCollection<E>- Overrides:
clearin classAbstractCollectionDecorator<E>
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iterator
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offer
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poll
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remove
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remove
- Specified by:
removein interfaceCollection<E>- Overrides:
removein classAbstractCollectionDecorator<E>
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removeAll
- Specified by:
removeAllin interfaceCollection<E>- Overrides:
removeAllin classAbstractCollectionDecorator<E>
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removeIf
- Specified by:
removeIfin interfaceCollection<E>- Overrides:
removeIfin classAbstractCollectionDecorator<E>- Since:
- 4.4
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retainAll
- Specified by:
retainAllin interfaceCollection<E>- Overrides:
retainAllin classAbstractCollectionDecorator<E>
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