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* @author Doug Lea |
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* @author Josh Bloch |
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* @since 1.6 |
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* @param <E> the type of elements held in this collection |
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* @param <E> the type of elements held in this deque |
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*/ |
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public interface Deque<E> extends Queue<E> { |
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/** |
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* Removes the first occurrence of the specified element from this deque. |
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* If the deque does not contain the element, it is unchanged. |
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* More formally, removes the first element {@code e} such that |
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* <tt>(o==null ? e==null : o.equals(e))</tt> |
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* (if such an element exists). |
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* {@code Objects.equals(o, e)} (if such an element exists). |
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* Returns {@code true} if this deque contained the specified element |
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* (or equivalently, if this deque changed as a result of the call). |
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* |
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* @return {@code true} if an element was removed as a result of this call |
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* @throws ClassCastException if the class of the specified element |
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* is incompatible with this deque |
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* (<a href="../Collection.html#optional-restrictions">optional</a>) |
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* @throws NullPointerException if the specified element is null |
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* (<a href="../Collection.html#optional-restrictions">optional</a>) |
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* (<a href="Collection.html#optional-restrictions">optional</a>) |
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* @throws NullPointerException if the specified element is null and this |
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* deque does not permit null elements |
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* (<a href="Collection.html#optional-restrictions">optional</a>) |
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*/ |
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boolean removeFirstOccurrence(Object o); |
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|
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* Removes the last occurrence of the specified element from this deque. |
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* If the deque does not contain the element, it is unchanged. |
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* More formally, removes the last element {@code e} such that |
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* <tt>(o==null ? e==null : o.equals(e))</tt> |
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* (if such an element exists). |
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* {@code Objects.equals(o, e)} (if such an element exists). |
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* Returns {@code true} if this deque contained the specified element |
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* (or equivalently, if this deque changed as a result of the call). |
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* |
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* @return {@code true} if an element was removed as a result of this call |
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* @throws ClassCastException if the class of the specified element |
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* is incompatible with this deque |
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* (<a href="../Collection.html#optional-restrictions">optional</a>) |
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* @throws NullPointerException if the specified element is null |
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* (<a href="../Collection.html#optional-restrictions">optional</a>) |
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* (<a href="Collection.html#optional-restrictions">optional</a>) |
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* @throws NullPointerException if the specified element is null and this |
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* deque does not permit null elements |
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* (<a href="Collection.html#optional-restrictions">optional</a>) |
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*/ |
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boolean removeLastOccurrence(Object o); |
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|
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* Removes the first occurrence of the specified element from this deque. |
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* If the deque does not contain the element, it is unchanged. |
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* More formally, removes the first element {@code e} such that |
493 |
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* <tt>(o==null ? e==null : o.equals(e))</tt> |
494 |
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* (if such an element exists). |
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* {@code Objects.equals(o, e)} (if such an element exists). |
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* Returns {@code true} if this deque contained the specified element |
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* (or equivalently, if this deque changed as a result of the call). |
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* |
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* @return {@code true} if an element was removed as a result of this call |
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* @throws ClassCastException if the class of the specified element |
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* is incompatible with this deque |
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* (<a href="../Collection.html#optional-restrictions">optional</a>) |
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* @throws NullPointerException if the specified element is null |
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* (<a href="../Collection.html#optional-restrictions">optional</a>) |
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* (<a href="Collection.html#optional-restrictions">optional</a>) |
504 |
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* @throws NullPointerException if the specified element is null and this |
505 |
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* deque does not permit null elements |
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* (<a href="Collection.html#optional-restrictions">optional</a>) |
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*/ |
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boolean remove(Object o); |
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|
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/** |
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* Returns {@code true} if this deque contains the specified element. |
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* More formally, returns {@code true} if and only if this deque contains |
513 |
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* at least one element {@code e} such that |
514 |
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* <tt>(o==null ? e==null : o.equals(e))</tt>. |
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* at least one element {@code e} such that {@code Objects.equals(o, e)}. |
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* |
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* @param o element whose presence in this deque is to be tested |
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* @return {@code true} if this deque contains the specified element |
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* @throws ClassCastException if the class of the specified element |
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* is incompatible with this deque |
519 |
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* (<a href="../Collection.html#optional-restrictions">optional</a>) |
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* @throws NullPointerException if the specified element is null |
521 |
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* (<a href="../Collection.html#optional-restrictions">optional</a>) |
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* (<a href="Collection.html#optional-restrictions">optional</a>) |
520 |
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* @throws NullPointerException if the specified element is null and this |
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* deque does not permit null elements |
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* (<a href="Collection.html#optional-restrictions">optional</a>) |
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*/ |
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boolean contains(Object o); |
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|
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* |
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* @return the number of elements in this deque |
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*/ |
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public int size(); |
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> |
int size(); |
532 |
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|
533 |
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/** |
534 |
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* Returns an iterator over the elements in this deque in proper sequence. |