507 modCount++; 508 return newEntry; 509 } 510 511 // 将节点从链表中删除 512 private E remove(Entry<E> e) { 513 if (e == header) 514 throw new NoSuchElementException(); 515 516 E result = e.element; 517 e.previous.next = e.next; 518 e.next.previous = e.previous; 519 e....
getFirst()和element(),返回列表的头部而并不删除它,如果List为空,则抛出NoSuchElementException。peek()方法与这两个方法只是稍有差异,它在列表为空时返回null。 removeFirst()和remove(),删除并返回列表的头部元素,并在列表为空时抛出NoSuchElementException异常。poll()稍有差异,它在列表为空时返回null。 addFirst...
The user of this interface has precise control over where in the list each element is inserted. The user can access elements by their integer index (position in the list), and search for elements in the list. 可以看到,List 接口的实现类在实现插入元素时,都会根据索引进行排列。 比如ArrayList,本...
Theremove(Object)method removes the first occurrence of the specified elementEin this list. As this method removes the object, the list size decreases by one. ArrayList<String>namesList=newArrayList<>(Arrays.asList("alex","brian","charles","alex"));System.out.println(namesList);namesList.remo...
小结: 1、 This method is used to replace the definition of a class without reference to the existing class file bytes, as one might do when recompiling f
/*** Inserts the specified element at the beginning of this list. * *@parame the element to add*/publicvoidaddFirst(E e) { linkFirst(e); }/*** Links e as first element. * 在表头添加指定元素e 即链接头节点*/privatevoidlinkFirst(E e) {finalNode<E> f = first;//将头结点赋给f节...
("PatternSelector") final PatternSelector patternSelector, @PluginConfiguration final Configuration config, @PluginElement("Replace") final RegexReplacement replace, // LOG4J2-783 use platform default by default, so do not specify defaultString for charset @PluginAttribute(value = "charset") final ...
An iterator for lists that allows the programmer to traverse the list in either direction, modify the list during iteration, and obtain the iterator's current position in the list. A ListIterator has no current element; its cursor position always lies between the element that would be returned...
voidadd(int index,Eelement) Inserts the specified element at the specified position in this list (optional operation). booleanaddAll(Collection<? extendsE> c) Appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specifie...
In contrast, the remove() method is used to remove only the first occurrence of the specified element. Quick ReferenceArrayList<String> alphabets = new ArrayList<>(Arrays.asList("A", "B", "C", "C", "D")); //1 - Removes all occurrences of an element alphabets.removeAll(Collections....