89 |
|
* collection, in the order they are returned by the collection's |
90 |
|
* iterator. |
91 |
|
* |
92 |
< |
* @param c the collection whose elements are to be placed into this list. |
93 |
< |
* @throws NullPointerException if the specified collection is null. |
92 |
> |
* @param c the collection whose elements are to be placed into this list |
93 |
> |
* @throws NullPointerException if the specified collection is null |
94 |
|
*/ |
95 |
|
public LinkedList(Collection<? extends E> c) { |
96 |
|
this(); |
100 |
|
/** |
101 |
|
* Returns the first element in this list. |
102 |
|
* |
103 |
< |
* @return the first element in this list. |
104 |
< |
* @throws NoSuchElementException if this list is empty. |
103 |
> |
* @return the first element in this list |
104 |
> |
* @throws NoSuchElementException if this list is empty |
105 |
|
*/ |
106 |
|
public E getFirst() { |
107 |
|
if (size==0) |
113 |
|
/** |
114 |
|
* Returns the last element in this list. |
115 |
|
* |
116 |
< |
* @return the last element in this list. |
117 |
< |
* @throws NoSuchElementException if this list is empty. |
116 |
> |
* @return the last element in this list |
117 |
> |
* @throws NoSuchElementException if this list is empty |
118 |
|
*/ |
119 |
|
public E getLast() { |
120 |
|
if (size==0) |
126 |
|
/** |
127 |
|
* Removes and returns the first element from this list. |
128 |
|
* |
129 |
< |
* @return the first element from this list. |
130 |
< |
* @throws NoSuchElementException if this list is empty. |
129 |
> |
* @return the first element from this list |
130 |
> |
* @throws NoSuchElementException if this list is empty |
131 |
|
*/ |
132 |
|
public E removeFirst() { |
133 |
|
return remove(header.next); |
136 |
|
/** |
137 |
|
* Removes and returns the last element from this list. |
138 |
|
* |
139 |
< |
* @return the last element from this list. |
140 |
< |
* @throws NoSuchElementException if this list is empty. |
139 |
> |
* @return the last element from this list |
140 |
> |
* @throws NoSuchElementException if this list is empty |
141 |
|
*/ |
142 |
|
public E removeLast() { |
143 |
|
return remove(header.previous); |
146 |
|
/** |
147 |
|
* Inserts the given element at the beginning of this list. |
148 |
|
* |
149 |
< |
* @param o the element to be inserted at the beginning of this list. |
149 |
> |
* @param e the element to be inserted at the beginning of this list |
150 |
|
*/ |
151 |
< |
public void addFirst(E o) { |
152 |
< |
addBefore(o, header.next); |
151 |
> |
public void addFirst(E e) { |
152 |
> |
addBefore(e, header.next); |
153 |
|
} |
154 |
|
|
155 |
|
/** |
156 |
|
* Appends the given element to the end of this list. (Identical in |
157 |
|
* function to the <tt>add</tt> method; included only for consistency.) |
158 |
|
* |
159 |
< |
* @param o the element to be inserted at the end of this list. |
159 |
> |
* @param e the element to be inserted at the end of this list |
160 |
|
*/ |
161 |
< |
public void addLast(E o) { |
162 |
< |
addBefore(o, header); |
161 |
> |
public void addLast(E e) { |
162 |
> |
addBefore(e, header); |
163 |
|
} |
164 |
|
|
165 |
|
/** |
168 |
|
* at least one element <tt>e</tt> such that <tt>(o==null ? e==null |
169 |
|
* : o.equals(e))</tt>. |
170 |
|
* |
171 |
< |
* @param o element whose presence in this list is to be tested. |
172 |
< |
* @return <tt>true</tt> if this list contains the specified element. |
171 |
> |
* @param o element whose presence in this list is to be tested |
172 |
> |
* @return <tt>true</tt> if this list contains the specified element |
173 |
|
*/ |
174 |
|
public boolean contains(Object o) { |
175 |
|
return indexOf(o) != -1; |
178 |
|
/** |
179 |
|
* Returns the number of elements in this list. |
180 |
|
* |
181 |
< |
* @return the number of elements in this list. |
181 |
> |
* @return the number of elements in this list |
182 |
|
*/ |
183 |
|
public int size() { |
184 |
|
return size; |
187 |
|
/** |
188 |
|
* Appends the specified element to the end of this list. |
189 |
|
* |
190 |
< |
* @param o element to be appended to this list. |
191 |
< |
* @return <tt>true</tt> (as per the general contract of |
192 |
< |
* <tt>Collection.add</tt>). |
190 |
> |
* @param e element to be appended to this list |
191 |
> |
* @return <tt>true</tt> (as per the spec for {@link Collection#add}) |
192 |
|
*/ |
193 |
< |
public boolean add(E o) { |
194 |
< |
addBefore(o, header); |
193 |
> |
public boolean add(E e) { |
194 |
> |
addBefore(e, header); |
195 |
|
return true; |
196 |
|
} |
197 |
|
|
202 |
|
* <tt>(o==null ? get(i)==null : o.equals(get(i)))</tt> (if such an |
203 |
|
* element exists). |
204 |
|
* |
205 |
< |
* @param o element to be removed from this list, if present. |
206 |
< |
* @return <tt>true</tt> if the list contained the specified element. |
205 |
> |
* @param o element to be removed from this list, if present |
206 |
> |
* @return <tt>true</tt> if the list contained the specified element |
207 |
|
*/ |
208 |
|
public boolean remove(Object o) { |
209 |
|
if (o==null) { |
232 |
|
* progress. (This implies that the behavior of this call is undefined if |
233 |
|
* the specified Collection is this list, and this list is nonempty.) |
234 |
|
* |
235 |
< |
* @param c the elements to be inserted into this list. |
236 |
< |
* @return <tt>true</tt> if this list changed as a result of the call. |
237 |
< |
* @throws NullPointerException if the specified collection is null. |
235 |
> |
* @param c the elements to be inserted into this list |
236 |
> |
* @return <tt>true</tt> if this list changed as a result of the call |
237 |
> |
* @throws NullPointerException if the specified collection is null |
238 |
|
*/ |
239 |
|
public boolean addAll(Collection<? extends E> c) { |
240 |
|
return addAll(size, c); |
248 |
|
* in the list in the order that they are returned by the |
249 |
|
* specified collection's iterator. |
250 |
|
* |
251 |
< |
* @param index index at which to insert first element |
252 |
< |
* from the specified collection. |
253 |
< |
* @param c elements to be inserted into this list. |
254 |
< |
* @return <tt>true</tt> if this list changed as a result of the call. |
251 |
> |
* @param index index at which to insert the first element |
252 |
> |
* from the specified collection |
253 |
> |
* @param c elements to be inserted into this list |
254 |
> |
* @return <tt>true</tt> if this list changed as a result of the call |
255 |
|
* @throws IndexOutOfBoundsException if the index is out of range |
256 |
< |
* (<tt>index < 0 || index > size()</tt>). |
257 |
< |
* @throws NullPointerException if the specified collection is null. |
256 |
> |
* (<tt>index < 0 || index > size()</tt>) |
257 |
> |
* @throws NullPointerException if the specified collection is null |
258 |
|
*/ |
259 |
|
public boolean addAll(int index, Collection<? extends E> c) { |
260 |
|
if (index < 0 || index > size) |
301 |
|
/** |
302 |
|
* Returns the element at the specified position in this list. |
303 |
|
* |
304 |
< |
* @param index index of element to return. |
305 |
< |
* @return the element at the specified position in this list. |
307 |
< |
* |
304 |
> |
* @param index index of element to return |
305 |
> |
* @return the element at the specified position in this list |
306 |
|
* @throws IndexOutOfBoundsException if the index is out of range |
307 |
< |
* (<tt>index < 0 || index > size()</tt>). |
307 |
> |
* (<tt>index < 0 || index > size()</tt>) |
308 |
|
*/ |
309 |
|
public E get(int index) { |
310 |
|
return entry(index).element; |
314 |
|
* Replaces the element at the specified position in this list with the |
315 |
|
* specified element. |
316 |
|
* |
317 |
< |
* @param index index of element to replace. |
318 |
< |
* @param element element to be stored at the specified position. |
319 |
< |
* @return the element previously at the specified position. |
317 |
> |
* @param index index of element to replace |
318 |
> |
* @param element element to be stored at the specified position |
319 |
> |
* @return the element previously at the specified position |
320 |
|
* @throws IndexOutOfBoundsException if the index is out of range |
321 |
< |
* (<tt>index < 0 || index > size()</tt>). |
321 |
> |
* (<tt>index < 0 || index > size()</tt>) |
322 |
|
*/ |
323 |
|
public E set(int index, E element) { |
324 |
|
Entry<E> e = entry(index); |
332 |
|
* Shifts the element currently at that position (if any) and any |
333 |
|
* subsequent elements to the right (adds one to their indices). |
334 |
|
* |
335 |
< |
* @param index index at which the specified element is to be inserted. |
336 |
< |
* @param element element to be inserted. |
335 |
> |
* @param index index at which the specified element is to be inserted |
336 |
> |
* @param element element to be inserted |
337 |
|
* |
338 |
|
* @throws IndexOutOfBoundsException if the index is out of range |
339 |
< |
* (<tt>index < 0 || index > size()</tt>). |
339 |
> |
* (<tt>index < 0 || index > size()</tt>) |
340 |
|
*/ |
341 |
|
public void add(int index, E element) { |
342 |
|
addBefore(element, (index==size ? header : entry(index))); |
347 |
|
* subsequent elements to the left (subtracts one from their indices). |
348 |
|
* Returns the element that was removed from the list. |
349 |
|
* |
350 |
< |
* @param index the index of the element to removed. |
351 |
< |
* @return the element previously at the specified position. |
350 |
> |
* @param index the index of the element to be removed |
351 |
> |
* @return the element previously at the specified position |
352 |
|
* |
353 |
|
* @throws IndexOutOfBoundsException if the index is out of range |
354 |
< |
* (<tt>index < 0 || index > size()</tt>). |
354 |
> |
* (<tt>index < 0 || index > size()</tt>) |
355 |
|
*/ |
356 |
|
public E remove(int index) { |
357 |
|
return remove(entry(index)); |
385 |
|
* <tt>(o==null ? get(i)==null : o.equals(get(i)))</tt>, or -1 if |
386 |
|
* there is no such index. |
387 |
|
* |
388 |
< |
* @param o element to search for. |
388 |
> |
* @param o element to search for |
389 |
|
* @return the index in this list of the first occurrence of the |
390 |
< |
* specified element, or -1 if the list does not contain this |
391 |
< |
* element. |
390 |
> |
* specified element, or -1 if the list does not contain this |
391 |
> |
* element |
392 |
|
*/ |
393 |
|
public int indexOf(Object o) { |
394 |
|
int index = 0; |
415 |
|
* <tt>(o==null ? get(i)==null : o.equals(get(i)))</tt>, or -1 if |
416 |
|
* there is no such index. |
417 |
|
* |
418 |
< |
* @param o element to search for. |
418 |
> |
* @param o element to search for |
419 |
|
* @return the index in this list of the last occurrence of the |
420 |
< |
* specified element, or -1 if the list does not contain this |
421 |
< |
* element. |
420 |
> |
* specified element, or -1 if the list does not contain this |
421 |
> |
* element |
422 |
|
*/ |
423 |
|
public int lastIndexOf(Object o) { |
424 |
|
int index = size; |
442 |
|
|
443 |
|
/** |
444 |
|
* Retrieves, but does not remove, the head (first element) of this list. |
445 |
< |
* @return the head of this list, or <tt>null</tt> if this list is empty. |
445 |
> |
* @return the head of this list, or <tt>null</tt> if this list is empty |
446 |
|
* @since 1.5 |
447 |
|
*/ |
448 |
|
public E peek() { |
453 |
|
|
454 |
|
/** |
455 |
|
* Retrieves, but does not remove, the head (first element) of this list. |
456 |
< |
* @return the head of this list. |
457 |
< |
* @throws NoSuchElementException if this list is empty. |
456 |
> |
* @return the head of this list |
457 |
> |
* @throws NoSuchElementException if this list is empty |
458 |
|
* @since 1.5 |
459 |
|
*/ |
460 |
|
public E element() { |
462 |
|
} |
463 |
|
|
464 |
|
/** |
465 |
< |
* Retrieves and removes the head (first element) of this list. |
466 |
< |
* @return the head of this list, or <tt>null</tt> if this list is empty. |
465 |
> |
* Retrieves and removes the head (first element) of this list |
466 |
> |
* @return the head of this list, or <tt>null</tt> if this list is empty |
467 |
|
* @since 1.5 |
468 |
|
*/ |
469 |
|
public E poll() { |
474 |
|
|
475 |
|
/** |
476 |
|
* Retrieves and removes the head (first element) of this list. |
477 |
< |
* @return the head of this list. |
478 |
< |
* @throws NoSuchElementException if this list is empty. |
477 |
> |
* |
478 |
> |
* @return the head of this list |
479 |
> |
* @throws NoSuchElementException if this list is empty |
480 |
|
* @since 1.5 |
481 |
|
*/ |
482 |
|
public E remove() { |
486 |
|
/** |
487 |
|
* Adds the specified element as the tail (last element) of this list. |
488 |
|
* |
489 |
< |
* @param o the element to add. |
490 |
< |
* @return <tt>true</tt> (as per the general contract of |
492 |
< |
* <tt>Queue.offer</tt>) |
489 |
> |
* @param e the element to add |
490 |
> |
* @return <tt>true</tt> (as per the spec for {@link Queue#offer}) |
491 |
|
* @since 1.5 |
492 |
|
*/ |
493 |
< |
public boolean offer(E o) { |
494 |
< |
return add(o); |
493 |
> |
public boolean offer(E e) { |
494 |
> |
return add(e); |
495 |
|
} |
496 |
|
|
497 |
|
// Deque operations |
521 |
|
|
522 |
|
/** |
523 |
|
* Retrieves, but does not remove, the first element of this list, |
524 |
< |
* returning <tt>null</tt> if this list is empty. |
524 |
> |
* or returns <tt>null</tt> if this list is empty. |
525 |
|
* |
526 |
< |
* @return the first element of this list, or <tt>null</tt> if |
527 |
< |
* this list is empty |
526 |
> |
* @return the first element of this list, or <tt>null</tt> |
527 |
> |
* if this list is empty. |
528 |
|
* @since 1.6 |
529 |
|
*/ |
530 |
|
public E peekFirst() { |
535 |
|
|
536 |
|
/** |
537 |
|
* Retrieves, but does not remove, the last element of this list, |
538 |
< |
* returning <tt>null</tt> if this list is empty. |
538 |
> |
* or returns <tt>null</tt> if this list is empty. |
539 |
|
* |
540 |
< |
* @return the last element of this list, or <tt>null</tt> if this list |
541 |
< |
* is empty |
540 |
> |
* @return the last element of this list, or <tt>null</tt> |
541 |
> |
* if this list is empty. |
542 |
|
* @since 1.6 |
543 |
|
*/ |
544 |
|
public E peekLast() { |
595 |
|
* <p>This method is equivalent to {@link #removeFirst()}. |
596 |
|
* |
597 |
|
* @return the element at the front of this list (which is the top |
598 |
< |
* of the stack represented by this list) |
599 |
< |
* @throws NoSuchElementException if this list is empty. |
598 |
> |
* of the stack represented by this list) |
599 |
> |
* @throws NoSuchElementException if this list is empty |
600 |
|
* @since 1.6 |
601 |
|
*/ |
602 |
|
public E pop() { |
658 |
|
* than risking arbitrary, non-deterministic behavior at an undetermined |
659 |
|
* time in the future. |
660 |
|
* |
661 |
< |
* @param index index of first element to be returned from the |
662 |
< |
* list-iterator (by a call to <tt>next</tt>). |
661 |
> |
* @param index index of the first element to be returned from the |
662 |
> |
* list-iterator (by a call to <tt>next</tt>). |
663 |
|
* @return a ListIterator of the elements in this list (in proper |
664 |
< |
* sequence), starting at the specified position in the list. |
664 |
> |
* sequence), starting at the specified position in the list. |
665 |
|
* @throws IndexOutOfBoundsException if the index is out of range |
666 |
|
* (<tt>index < 0 || index > size()</tt>). |
667 |
|
* @see List#listIterator(int) |
744 |
|
expectedModCount++; |
745 |
|
} |
746 |
|
|
747 |
< |
public void set(E o) { |
747 |
> |
public void set(E e) { |
748 |
|
if (lastReturned == header) |
749 |
|
throw new IllegalStateException(); |
750 |
|
checkForComodification(); |
751 |
< |
lastReturned.element = o; |
751 |
> |
lastReturned.element = e; |
752 |
|
} |
753 |
|
|
754 |
< |
public void add(E o) { |
754 |
> |
public void add(E e) { |
755 |
|
checkForComodification(); |
756 |
|
lastReturned = header; |
757 |
< |
addBefore(o, next); |
757 |
> |
addBefore(e, next); |
758 |
|
nextIndex++; |
759 |
|
expectedModCount++; |
760 |
|
} |
777 |
|
} |
778 |
|
} |
779 |
|
|
780 |
< |
private Entry<E> addBefore(E o, Entry<E> e) { |
781 |
< |
Entry<E> newEntry = new Entry<E>(o, e, e.previous); |
780 |
> |
private Entry<E> addBefore(E e, Entry<E> entry) { |
781 |
> |
Entry<E> newEntry = new Entry<E>(e, entry, entry.previous); |
782 |
|
newEntry.previous.next = newEntry; |
783 |
|
newEntry.next.previous = newEntry; |
784 |
|
size++; |
804 |
|
* Returns a shallow copy of this <tt>LinkedList</tt>. (The elements |
805 |
|
* themselves are not cloned.) |
806 |
|
* |
807 |
< |
* @return a shallow copy of this <tt>LinkedList</tt> instance. |
807 |
> |
* @return a shallow copy of this <tt>LinkedList</tt> instance |
808 |
|
*/ |
809 |
|
public Object clone() { |
810 |
|
LinkedList<E> clone = null; |
832 |
|
* in the correct order. |
833 |
|
* |
834 |
|
* @return an array containing all of the elements in this list |
835 |
< |
* in the correct order. |
835 |
> |
* in the correct order. |
836 |
|
*/ |
837 |
|
public Object[] toArray() { |
838 |
|
Object[] result = new Object[size]; |
857 |
|
* does not contain any null elements. |
858 |
|
* |
859 |
|
* @param a the array into which the elements of the list are to |
860 |
< |
* be stored, if it is big enough; otherwise, a new array of the |
861 |
< |
* same runtime type is allocated for this purpose. |
862 |
< |
* @return an array containing the elements of the list. |
860 |
> |
* be stored, if it is big enough; otherwise, a new array of the |
861 |
> |
* same runtime type is allocated for this purpose. |
862 |
> |
* @return an array containing the elements of the list |
863 |
|
* @throws ArrayStoreException if the runtime type of a is not a |
864 |
< |
* supertype of the runtime type of every element in this list. |
865 |
< |
* @throws NullPointerException if the specified array is null. |
864 |
> |
* supertype of the runtime type of every element in this list |
865 |
> |
* @throws NullPointerException if the specified array is null |
866 |
|
*/ |
867 |
|
public <T> T[] toArray(T[] a) { |
868 |
|
if (a.length < size) |
886 |
|
* is, serialize it). |
887 |
|
* |
888 |
|
* @serialData The size of the list (the number of elements it |
889 |
< |
* contains) is emitted (int), followed by all of its |
890 |
< |
* elements (each an Object) in the proper order. |
889 |
> |
* contains) is emitted (int), followed by all of its |
890 |
> |
* elements (each an Object) in the proper order. |
891 |
|
*/ |
892 |
|
private void writeObject(java.io.ObjectOutputStream s) |
893 |
|
throws java.io.IOException { |