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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain. Use, modify, and |
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* redistribute this code in any way without acknowledgement. |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/licenses/publicdomain |
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*/ |
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package java.util; |
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* as well. If these requirements cannot be met, consider instead |
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* subclassing {@link AbstractCollection}. |
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* |
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* <p>This class is a member of the |
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* <a href="{@docRoot}/../guide/collections/index.html"> |
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* Java Collections Framework</a>. |
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* |
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* @since 1.5 |
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* @author Doug Lea |
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* @param <E> the type of elements held in this collection |
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*/ |
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public abstract class AbstractQueue<E> |
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extends AbstractCollection<E> |
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while (poll() != null) |
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; |
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} |
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|
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/** |
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* Adds all of the elements in the specified collection to this |
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* queue. Attempts to addAll of a queue to itself result in |
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* <tt>IllegalArgumentException</tt>. Further, the behavior of |
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* this operation is undefined if the specified collection is |
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* modified while the operation is in progress. |
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* |
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* <p>This implementation iterates over the specified collection, |
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* and adds each element returned by the iterator to this |
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* collection, in turn. A runtime exception encountered while |
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* trying to add an element (including, in particular, a |
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* <tt>null</tt> element) may result in only some of the elements |
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* having been successfully added when the associated exception is |
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* thrown. |
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* |
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* @param c collection whose elements are to be added to this collection. |
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* @return <tt>true</tt> if this collection changed as a result of the |
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* call. |
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* @throws NullPointerException if the specified collection or |
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* any of its elements are null. |
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* @throws IllegalArgumentException if c is this queue. |
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* |
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* @see #add(Object) |
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*/ |
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public boolean addAll(Collection<? extends E> c) { |
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if (c == null) |
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throw new NullPointerException(); |
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if (c == this) |
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throw new IllegalArgumentException(); |
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boolean modified = false; |
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Iterator<? extends E> e = c.iterator(); |
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while (e.hasNext()) { |
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if (add(e.next())) |
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modified = true; |
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} |
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return modified; |
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} |
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|
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} |
