| 8 |
|
package java.util; |
| 9 |
|
|
| 10 |
|
/** |
| 11 |
< |
* An unbounded priority {@linkplain Queue queue} based on a priority |
| 12 |
< |
* heap. The elements of the priority queue are ordered according to |
| 13 |
< |
* their {@linkplain Comparable natural ordering}, or by a {@link |
| 14 |
< |
* Comparator} provided at queue construction time, depending on which |
| 15 |
< |
* constructor is used. A priority queue does not permit |
| 16 |
< |
* <tt>null</tt> elements. A priority queue relying on natural |
| 17 |
< |
* ordering also does not permit insertion of non-comparable objects |
| 18 |
< |
* (doing so may result in <tt>ClassCastException</tt>). |
| 11 |
> |
* An unbounded priority {@linkplain Queue queue} based on a priority heap. |
| 12 |
> |
* The elements of the priority queue are ordered according to their |
| 13 |
> |
* {@linkplain Comparable natural ordering}, or by a {@link Comparator} |
| 14 |
> |
* provided at queue construction time, depending on which constructor is |
| 15 |
> |
* used. A priority queue does not permit {@code null} elements. |
| 16 |
> |
* A priority queue relying on natural ordering also does not permit |
| 17 |
> |
* insertion of non-comparable objects (doing so may result in |
| 18 |
> |
* {@code ClassCastException}). |
| 19 |
|
* |
| 20 |
|
* <p>The <em>head</em> of this queue is the <em>least</em> element |
| 21 |
|
* with respect to the specified ordering. If multiple elements are |
| 22 |
|
* tied for least value, the head is one of those elements -- ties are |
| 23 |
< |
* broken arbitrarily. The queue retrieval operations <tt>poll</tt>, |
| 24 |
< |
* <tt>remove</tt>, <tt>peek</tt>, and <tt>element</tt> access the |
| 23 |
> |
* broken arbitrarily. The queue retrieval operations {@code poll}, |
| 24 |
> |
* {@code remove}, {@code peek}, and {@code element} access the |
| 25 |
|
* element at the head of the queue. |
| 26 |
|
* |
| 27 |
|
* <p>A priority queue is unbounded, but has an internal |
| 36 |
|
* Iterator} interfaces. The Iterator provided in method {@link |
| 37 |
|
* #iterator()} is <em>not</em> guaranteed to traverse the elements of |
| 38 |
|
* the priority queue in any particular order. If you need ordered |
| 39 |
< |
* traversal, consider using <tt>Arrays.sort(pq.toArray())</tt>. |
| 39 |
> |
* traversal, consider using {@code Arrays.sort(pq.toArray())}. |
| 40 |
|
* |
| 41 |
|
* <p> <strong>Note that this implementation is not synchronized.</strong> |
| 42 |
< |
* Multiple threads should not access a <tt>PriorityQueue</tt> |
| 43 |
< |
* instance concurrently if any of the threads modifies the list |
| 44 |
< |
* structurally. Instead, use the thread-safe {@link |
| 42 |
> |
* Multiple threads should not access a {@code PriorityQueue} |
| 43 |
> |
* instance concurrently if any of the threads modifies the queue. |
| 44 |
> |
* Instead, use the thread-safe {@link |
| 45 |
|
* java.util.concurrent.PriorityBlockingQueue} class. |
| 46 |
|
* |
| 47 |
< |
* <p>Implementation note: this implementation provides O(log(n)) time |
| 48 |
< |
* for the insertion methods (<tt>offer</tt>, <tt>poll</tt>, |
| 49 |
< |
* <tt>remove()</tt> and <tt>add</tt>) methods; linear time for the |
| 50 |
< |
* <tt>remove(Object)</tt> and <tt>contains(Object)</tt> methods; and |
| 51 |
< |
* constant time for the retrieval methods (<tt>peek</tt>, |
| 52 |
< |
* <tt>element</tt>, and <tt>size</tt>). |
| 47 |
> |
* <p>Implementation note: this implementation provides |
| 48 |
> |
* O(log(n)) time for the enqueing and dequeing methods |
| 49 |
> |
* ({@code offer}, {@code poll}, {@code remove()} and {@code add}); |
| 50 |
> |
* linear time for the {@code remove(Object)} and {@code contains(Object)} |
| 51 |
> |
* methods; and constant time for the retrieval methods |
| 52 |
> |
* ({@code peek}, {@code element}, and {@code size}). |
| 53 |
|
* |
| 54 |
|
* <p>This class is a member of the |
| 55 |
|
* <a href="{@docRoot}/../guide/collections/index.html"> |
| 56 |
|
* Java Collections Framework</a>. |
| 57 |
+ |
* |
| 58 |
|
* @since 1.5 |
| 59 |
|
* @version %I%, %G% |
| 60 |
< |
* @author Josh Bloch |
| 60 |
> |
* @author Josh Bloch, Doug Lea |
| 61 |
|
* @param <E> the type of elements held in this collection |
| 62 |
|
*/ |
| 63 |
|
public class PriorityQueue<E> extends AbstractQueue<E> |
| 95 |
|
private transient int modCount = 0; |
| 96 |
|
|
| 97 |
|
/** |
| 98 |
< |
* Creates a <tt>PriorityQueue</tt> with the default initial |
| 98 |
> |
* Creates a {@code PriorityQueue} with the default initial |
| 99 |
|
* capacity (11) that orders its elements according to their |
| 100 |
|
* {@linkplain Comparable natural ordering}. |
| 101 |
|
*/ |
| 104 |
|
} |
| 105 |
|
|
| 106 |
|
/** |
| 107 |
< |
* Creates a <tt>PriorityQueue</tt> with the specified initial |
| 107 |
> |
* Creates a {@code PriorityQueue} with the specified initial |
| 108 |
|
* capacity that orders its elements according to their |
| 109 |
|
* {@linkplain Comparable natural ordering}. |
| 110 |
|
* |
| 111 |
|
* @param initialCapacity the initial capacity for this priority queue |
| 112 |
< |
* @throws IllegalArgumentException if <tt>initialCapacity</tt> is less |
| 113 |
< |
* than 1 |
| 112 |
> |
* @throws IllegalArgumentException if {@code initialCapacity} is less |
| 113 |
> |
* than 1 |
| 114 |
|
*/ |
| 115 |
|
public PriorityQueue(int initialCapacity) { |
| 116 |
|
this(initialCapacity, null); |
| 117 |
|
} |
| 118 |
|
|
| 119 |
|
/** |
| 120 |
< |
* Creates a <tt>PriorityQueue</tt> with the specified initial capacity |
| 120 |
> |
* Creates a {@code PriorityQueue} with the specified initial capacity |
| 121 |
|
* that orders its elements according to the specified comparator. |
| 122 |
|
* |
| 123 |
|
* @param initialCapacity the initial capacity for this priority queue |
| 124 |
< |
* @param comparator the comparator that will be used to order |
| 125 |
< |
* this priority queue. If <tt>null</tt>, the <i>natural |
| 126 |
< |
* ordering</i> of the elements will be used. |
| 127 |
< |
* @throws IllegalArgumentException if <tt>initialCapacity</tt> is |
| 124 |
> |
* @param comparator the comparator that will be used to order this |
| 125 |
> |
* priority queue. If {@code null}, the {@linkplain Comparable |
| 126 |
> |
* natural ordering} of the elements will be used. |
| 127 |
> |
* @throws IllegalArgumentException if {@code initialCapacity} is |
| 128 |
|
* less than 1 |
| 129 |
|
*/ |
| 130 |
|
public PriorityQueue(int initialCapacity, |
| 138 |
|
} |
| 139 |
|
|
| 140 |
|
/** |
| 141 |
< |
* Creates a <tt>PriorityQueue</tt> containing the elements in the |
| 142 |
< |
* specified collection. If the specified collection is an |
| 143 |
< |
* instance of a {@link java.util.SortedSet} or is another |
| 144 |
< |
* <tt>PriorityQueue</tt>, the priority queue will be ordered |
| 145 |
< |
* according to the same ordering. Otherwise, this priority queue |
| 146 |
< |
* will be ordered according to the natural ordering of its elements. |
| 141 |
> |
* Creates a {@code PriorityQueue} containing the elements in the |
| 142 |
> |
* specified collection. If the specified collection is an instance of |
| 143 |
> |
* a {@link SortedSet} or is another {@code PriorityQueue}, this |
| 144 |
> |
* priority queue will be ordered according to the same ordering. |
| 145 |
> |
* Otherwise, this priority queue will be ordered according to the |
| 146 |
> |
* {@linkplain Comparable natural ordering} of its elements. |
| 147 |
|
* |
| 148 |
|
* @param c the collection whose elements are to be placed |
| 149 |
|
* into this priority queue |
| 168 |
|
} |
| 169 |
|
|
| 170 |
|
/** |
| 171 |
< |
* Creates a <tt>PriorityQueue</tt> containing the elements in the |
| 171 |
> |
* Creates a {@code PriorityQueue} containing the elements in the |
| 172 |
|
* specified priority queue. This priority queue will be |
| 173 |
|
* ordered according to the same ordering as the given priority |
| 174 |
|
* queue. |
| 175 |
|
* |
| 176 |
|
* @param c the priority queue whose elements are to be placed |
| 177 |
|
* into this priority queue |
| 178 |
< |
* @throws ClassCastException if elements of <tt>c</tt> cannot be |
| 179 |
< |
* compared to one another according to <tt>c</tt>'s |
| 178 |
> |
* @throws ClassCastException if elements of {@code c} cannot be |
| 179 |
> |
* compared to one another according to {@code c}'s |
| 180 |
|
* ordering |
| 181 |
|
* @throws NullPointerException if the specified priority queue or any |
| 182 |
|
* of its elements are null |
| 187 |
|
} |
| 188 |
|
|
| 189 |
|
/** |
| 190 |
< |
* Creates a <tt>PriorityQueue</tt> containing the elements in the |
| 191 |
< |
* specified sorted set. This priority queue will be ordered |
| 190 |
> |
* Creates a {@code PriorityQueue} containing the elements in the |
| 191 |
> |
* specified sorted set. This priority queue will be ordered |
| 192 |
|
* according to the same ordering as the given sorted set. |
| 193 |
|
* |
| 194 |
|
* @param c the sorted set whose elements are to be placed |
| 195 |
< |
* into this priority queue. |
| 195 |
> |
* into this priority queue |
| 196 |
|
* @throws ClassCastException if elements of the specified sorted |
| 197 |
|
* set cannot be compared to one another according to the |
| 198 |
|
* sorted set's ordering |
| 205 |
|
} |
| 206 |
|
|
| 207 |
|
/** |
| 208 |
< |
* Initialize queue array with elements from the given Collection. |
| 208 |
> |
* Initializes queue array with elements from the given Collection. |
| 209 |
> |
* |
| 210 |
|
* @param c the collection |
| 211 |
|
*/ |
| 212 |
|
private void initFromCollection(Collection<? extends E> c) { |
| 241 |
|
/** |
| 242 |
|
* Inserts the specified element into this priority queue. |
| 243 |
|
* |
| 244 |
< |
* @return <tt>true</tt> (as specified by {@link Collection#add}) |
| 244 |
> |
* @return {@code true} (as specified by {@link Collection#add}) |
| 245 |
|
* @throws ClassCastException if the specified element cannot be |
| 246 |
|
* compared with elements currently in this priority queue |
| 247 |
|
* according to the priority queue's ordering |
| 254 |
|
/** |
| 255 |
|
* Inserts the specified element into this priority queue. |
| 256 |
|
* |
| 257 |
< |
* @return <tt>true</tt> (as specified by {@link Queue#offer}) |
| 257 |
> |
* @return {@code true} (as specified by {@link Queue#offer}) |
| 258 |
|
* @throws ClassCastException if the specified element cannot be |
| 259 |
|
* compared with elements currently in this priority queue |
| 260 |
|
* according to the priority queue's ordering |
| 292 |
|
|
| 293 |
|
/** |
| 294 |
|
* Removes a single instance of the specified element from this queue, |
| 295 |
< |
* if it is present. More formally, removes an element <tt>e</tt> such |
| 296 |
< |
* that <tt>o.equals(e)</tt>, if this queue contains one or more such |
| 297 |
< |
* elements. Returns true if this queue contained the specified element |
| 298 |
< |
* (or equivalently, if this queue changed as a result of the call). |
| 295 |
> |
* if it is present. More formally, removes an element {@code e} such |
| 296 |
> |
* that {@code o.equals(e)}, if this queue contains one or more such |
| 297 |
> |
* elements. Returns {@code true} if and only if this queue contained |
| 298 |
> |
* the specified element (or equivalently, if this queue changed as a |
| 299 |
> |
* result of the call). |
| 300 |
|
* |
| 301 |
|
* @param o element to be removed from this queue, if present |
| 302 |
< |
* @return <tt>true</tt> if this queue changed as a result of the call |
| 302 |
> |
* @return {@code true} if this queue changed as a result of the call |
| 303 |
|
*/ |
| 304 |
|
public boolean remove(Object o) { |
| 305 |
|
int i = indexOf(o); |
| 316 |
|
* Needed by iterator.remove. |
| 317 |
|
* |
| 318 |
|
* @param o element to be removed from this queue, if present |
| 319 |
< |
* @return <tt>true</tt> if removed |
| 319 |
> |
* @return {@code true} if removed |
| 320 |
|
*/ |
| 321 |
|
boolean removeEq(Object o) { |
| 322 |
|
for (int i = 0; i < size; i++) { |
| 329 |
|
} |
| 330 |
|
|
| 331 |
|
/** |
| 332 |
< |
* Returns <tt>true</tt> if this queue contains the specified element. |
| 333 |
< |
* More formally, returns <tt>true</tt> if and only if this queue contains |
| 334 |
< |
* at least one element <tt>e</tt> such that <tt>o.equals(e)</tt>. |
| 332 |
> |
* Returns {@code true} if this queue contains the specified element. |
| 333 |
> |
* More formally, returns {@code true} if and only if this queue contains |
| 334 |
> |
* at least one element {@code e} such that {@code o.equals(e)}. |
| 335 |
|
* |
| 336 |
|
* @param o object to be checked for containment in this queue |
| 337 |
< |
* @return <tt>true</tt> if this queue contains the specified element |
| 337 |
> |
* @return {@code true} if this queue contains the specified element |
| 338 |
|
*/ |
| 339 |
|
public boolean contains(Object o) { |
| 340 |
|
return indexOf(o) != -1; |
| 341 |
|
} |
| 342 |
|
|
| 343 |
|
/** |
| 344 |
< |
* Returns an array containing all of the elements in this queue, |
| 344 |
> |
* Returns an array containing all of the elements in this queue. |
| 345 |
|
* The elements are in no particular order. |
| 346 |
|
* |
| 347 |
|
* <p>The returned array will be "safe" in that no references to it are |
| 348 |
< |
* maintained by this list. (In other words, this method must allocate |
| 348 |
> |
* maintained by this queue. (In other words, this method must allocate |
| 349 |
|
* a new array). The caller is thus free to modify the returned array. |
| 350 |
|
* |
| 351 |
+ |
* <p>This method acts as bridge between array-based and collection-based |
| 352 |
+ |
* APIs. |
| 353 |
+ |
* |
| 354 |
|
* @return an array containing all of the elements in this queue |
| 355 |
|
*/ |
| 356 |
|
public Object[] toArray() { |
| 358 |
|
} |
| 359 |
|
|
| 360 |
|
/** |
| 361 |
< |
* Returns an array containing all of the elements in this queue. |
| 362 |
< |
* The elements are in no particular order. The runtime type of |
| 363 |
< |
* the returned array is that of the specified array. If the queue |
| 364 |
< |
* fits in the specified array, it is returned therein. |
| 365 |
< |
* Otherwise, a new array is allocated with the runtime type of |
| 366 |
< |
* the specified array and the size of this queue. |
| 361 |
> |
* Returns an array containing all of the elements in this queue; the |
| 362 |
> |
* runtime type of the returned array is that of the specified array. |
| 363 |
> |
* The returned array elements are in no particular order. |
| 364 |
> |
* If the queue fits in the specified array, it is returned therein. |
| 365 |
> |
* Otherwise, a new array is allocated with the runtime type of the |
| 366 |
> |
* specified array and the size of this queue. |
| 367 |
|
* |
| 368 |
|
* <p>If the queue fits in the specified array with room to spare |
| 369 |
|
* (i.e., the array has more elements than the queue), the element in |
| 370 |
|
* the array immediately following the end of the collection is set to |
| 371 |
< |
* <tt>null</tt>. (This is useful in determining the length of the |
| 372 |
< |
* queue <i>only</i> if the caller knows that the queue does not contain |
| 373 |
< |
* any null elements.) |
| 371 |
> |
* {@code null}. |
| 372 |
> |
* |
| 373 |
> |
* <p>Like the {@link #toArray()} method, this method acts as bridge between |
| 374 |
> |
* array-based and collection-based APIs. Further, this method allows |
| 375 |
> |
* precise control over the runtime type of the output array, and may, |
| 376 |
> |
* under certain circumstances, be used to save allocation costs. |
| 377 |
> |
* |
| 378 |
> |
* <p>Suppose <tt>x</tt> is a queue known to contain only strings. |
| 379 |
> |
* The following code can be used to dump the queue into a newly |
| 380 |
> |
* allocated array of <tt>String</tt>: |
| 381 |
> |
* |
| 382 |
> |
* <pre> |
| 383 |
> |
* String[] y = x.toArray(new String[0]);</pre> |
| 384 |
> |
* |
| 385 |
> |
* Note that <tt>toArray(new Object[0])</tt> is identical in function to |
| 386 |
> |
* <tt>toArray()</tt>. |
| 387 |
|
* |
| 388 |
|
* @param a the array into which the elements of the queue are to |
| 389 |
|
* be stored, if it is big enough; otherwise, a new array of the |
| 390 |
|
* same runtime type is allocated for this purpose. |
| 391 |
< |
* @return an array containing the elements of the queue |
| 391 |
> |
* @return an array containing all of the elements in this queue |
| 392 |
|
* @throws ArrayStoreException if the runtime type of the specified array |
| 393 |
|
* is not a supertype of the runtime type of every element in |
| 394 |
|
* this queue |
| 437 |
|
* after we've completed the "normal" iteration. |
| 438 |
|
* |
| 439 |
|
* We expect that most iterations, even those involving removals, |
| 440 |
< |
* will not use need to store elements in this field. |
| 440 |
> |
* will not need to store elements in this field. |
| 441 |
|
*/ |
| 442 |
|
private ArrayDeque<E> forgetMeNot = null; |
| 443 |
|
|
| 449 |
|
|
| 450 |
|
/** |
| 451 |
|
* The modCount value that the iterator believes that the backing |
| 452 |
< |
* List should have. If this expectation is violated, the iterator |
| 452 |
> |
* Queue should have. If this expectation is violated, the iterator |
| 453 |
|
* has detected concurrent modification. |
| 454 |
|
*/ |
| 455 |
|
private int expectedModCount = modCount; |
| 476 |
|
public void remove() { |
| 477 |
|
if (expectedModCount != modCount) |
| 478 |
|
throw new ConcurrentModificationException(); |
| 460 |
– |
if (lastRet == -1 && lastRetElt == null) |
| 461 |
– |
throw new IllegalStateException(); |
| 479 |
|
if (lastRet != -1) { |
| 480 |
|
E moved = PriorityQueue.this.removeAt(lastRet); |
| 481 |
|
lastRet = -1; |
| 486 |
|
forgetMeNot = new ArrayDeque<E>(); |
| 487 |
|
forgetMeNot.add(moved); |
| 488 |
|
} |
| 489 |
< |
} else { |
| 489 |
> |
} else if (lastRetElt != null) { |
| 490 |
|
PriorityQueue.this.removeEq(lastRetElt); |
| 491 |
|
lastRetElt = null; |
| 492 |
< |
} |
| 492 |
> |
} else { |
| 493 |
> |
throw new IllegalStateException(); |
| 494 |
> |
} |
| 495 |
|
expectedModCount = modCount; |
| 496 |
|
} |
| 478 |
– |
|
| 497 |
|
} |
| 498 |
|
|
| 499 |
|
public int size() { |
| 516 |
|
return null; |
| 517 |
|
int s = --size; |
| 518 |
|
modCount++; |
| 519 |
< |
E result = (E)queue[0]; |
| 520 |
< |
E x = (E)queue[s]; |
| 519 |
> |
E result = (E) queue[0]; |
| 520 |
> |
E x = (E) queue[s]; |
| 521 |
|
queue[s] = null; |
| 522 |
|
if (s != 0) |
| 523 |
|
siftDown(0, x); |
| 534 |
|
* i. Under these circumstances, this method returns the element |
| 535 |
|
* that was previously at the end of the list and is now at some |
| 536 |
|
* position before i. This fact is used by iterator.remove so as to |
| 537 |
< |
* avoid missing traverseing elements. |
| 537 |
> |
* avoid missing traversing elements. |
| 538 |
|
*/ |
| 539 |
|
private E removeAt(int i) { |
| 540 |
|
assert i >= 0 && i < size; |
| 579 |
|
while (k > 0) { |
| 580 |
|
int parent = (k - 1) >>> 1; |
| 581 |
|
Object e = queue[parent]; |
| 582 |
< |
if (key.compareTo((E)e) >= 0) |
| 582 |
> |
if (key.compareTo((E) e) >= 0) |
| 583 |
|
break; |
| 584 |
|
queue[k] = e; |
| 585 |
|
k = parent; |
| 591 |
|
while (k > 0) { |
| 592 |
|
int parent = (k - 1) >>> 1; |
| 593 |
|
Object e = queue[parent]; |
| 594 |
< |
if (comparator.compare(x, (E)e) >= 0) |
| 594 |
> |
if (comparator.compare(x, (E) e) >= 0) |
| 595 |
|
break; |
| 596 |
|
queue[k] = e; |
| 597 |
|
k = parent; |
| 622 |
|
Object c = queue[child]; |
| 623 |
|
int right = child + 1; |
| 624 |
|
if (right < size && |
| 625 |
< |
((Comparable<? super E>)c).compareTo((E)queue[right]) > 0) |
| 625 |
> |
((Comparable<? super E>) c).compareTo((E) queue[right]) > 0) |
| 626 |
|
c = queue[child = right]; |
| 627 |
< |
if (key.compareTo((E)c) <= 0) |
| 627 |
> |
if (key.compareTo((E) c) <= 0) |
| 628 |
|
break; |
| 629 |
|
queue[k] = c; |
| 630 |
|
k = child; |
| 639 |
|
Object c = queue[child]; |
| 640 |
|
int right = child + 1; |
| 641 |
|
if (right < size && |
| 642 |
< |
comparator.compare((E)c, (E)queue[right]) > 0) |
| 642 |
> |
comparator.compare((E) c, (E) queue[right]) > 0) |
| 643 |
|
c = queue[child = right]; |
| 644 |
< |
if (comparator.compare(x, (E)c) <= 0) |
| 644 |
> |
if (comparator.compare(x, (E) c) <= 0) |
| 645 |
|
break; |
| 646 |
|
queue[k] = c; |
| 647 |
|
k = child; |
| 655 |
|
*/ |
| 656 |
|
private void heapify() { |
| 657 |
|
for (int i = (size >>> 1) - 1; i >= 0; i--) |
| 658 |
< |
siftDown(i, (E)queue[i]); |
| 658 |
> |
siftDown(i, (E) queue[i]); |
| 659 |
|
} |
| 660 |
|
|
| 661 |
|
/** |
| 662 |
|
* Returns the comparator used to order the elements in this |
| 663 |
< |
* queue, or <tt>null</tt> if this queue is sorted according to |
| 663 |
> |
* queue, or {@code null} if this queue is sorted according to |
| 664 |
|
* the {@linkplain Comparable natural ordering} of its elements. |
| 665 |
|
* |
| 666 |
|
* @return the comparator used to order this queue, or |
| 667 |
< |
* <tt>null</tt> if this queue is sorted according to the |
| 668 |
< |
* natural ordering of its elements. |
| 667 |
> |
* {@code null} if this queue is sorted according to the |
| 668 |
> |
* natural ordering of its elements |
| 669 |
|
*/ |
| 670 |
|
public Comparator<? super E> comparator() { |
| 671 |
|
return comparator; |
| 672 |
|
} |
| 673 |
|
|
| 674 |
|
/** |
| 675 |
< |
* Save the state of the instance to a stream (that |
| 676 |
< |
* is, serialize it). |
| 675 |
> |
* Saves the state of the instance to a stream (that |
| 676 |
> |
* is, serializes it). |
| 677 |
|
* |
| 678 |
|
* @serialData The length of the array backing the instance is |
| 679 |
< |
* emitted (int), followed by all of its elements (each an |
| 680 |
< |
* <tt>Object</tt>) in the proper order. |
| 679 |
> |
* emitted (int), followed by all of its elements |
| 680 |
> |
* (each an {@code Object}) in the proper order. |
| 681 |
|
* @param s the stream |
| 682 |
|
*/ |
| 683 |
|
private void writeObject(java.io.ObjectOutputStream s) |
| 685 |
|
// Write out element count, and any hidden stuff |
| 686 |
|
s.defaultWriteObject(); |
| 687 |
|
|
| 688 |
< |
// Write out array length |
| 689 |
< |
// For compatibility with 1.5 version, must be at least 2. |
| 672 |
< |
s.writeInt(Math.max(2, queue.length)); |
| 688 |
> |
// Write out array length, for compatibility with 1.5 version |
| 689 |
> |
s.writeInt(Math.max(2, size + 1)); |
| 690 |
|
|
| 691 |
|
// Write out all elements in the proper order. |
| 692 |
< |
for (int i=0; i<size; i++) |
| 692 |
> |
for (int i = 0; i < size; i++) |
| 693 |
|
s.writeObject(queue[i]); |
| 694 |
|
} |
| 695 |
|
|
| 696 |
|
/** |
| 697 |
< |
* Reconstitute the <tt>PriorityQueue</tt> instance from a stream |
| 698 |
< |
* (that is, deserialize it). |
| 697 |
> |
* Reconstitutes the {@code PriorityQueue} instance from a stream |
| 698 |
> |
* (that is, deserializes it). |
| 699 |
> |
* |
| 700 |
|
* @param s the stream |
| 701 |
|
*/ |
| 702 |
|
private void readObject(java.io.ObjectInputStream s) |
| 704 |
|
// Read in size, and any hidden stuff |
| 705 |
|
s.defaultReadObject(); |
| 706 |
|
|
| 707 |
< |
// Read in array length and allocate array |
| 708 |
< |
int arrayLength = s.readInt(); |
| 709 |
< |
queue = new Object[arrayLength]; |
| 707 |
> |
// Read in (and discard) array length |
| 708 |
> |
s.readInt(); |
| 709 |
> |
|
| 710 |
> |
queue = new Object[size]; |
| 711 |
|
|
| 712 |
|
// Read in all elements in the proper order. |
| 713 |
< |
for (int i=0; i<size; i++) |
| 714 |
< |
queue[i] = (E) s.readObject(); |
| 713 |
> |
for (int i = 0; i < size; i++) |
| 714 |
> |
queue[i] = s.readObject(); |
| 715 |
|
} |
| 697 |
– |
|
| 716 |
|
} |
