Cours java: table des matières la classe ArrayList; la classe LinkedList. Arbres (application de démonstration). généralités · arbres binaires ordonnés. The Java ArrayList has many more functions than standard arrays. In this lesson, we will define the ArrayList get method, and provide working code. It’s no use: O-O plus Java is always expensive. Efficiency is . ArrayList. • Much lower fixed and variable costs than. HashMap or HashSet. • Fixed costs can still.

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This class is roughly equivalent to Vectorexcept that couurs is unsynchronized. The returned list supports all of the optional list operations. Otherwise, a new array is allocated with the runtime type of the specified array and the size of this list.

In other words, removes from this list all of its elements that vours not contained in the specified collection. The returned list is backed by this list, so non-structural changes in the returned list are reflected in this list, and vice-versa. Removes the element at the specified position in this list.

Cours java : table des matières

Appends the specified element to the end of this list. Appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified collection’s Iterator.


This method eliminates the need for explicit range operations of the sort that commonly exist for arrays. The elements themselves are not copied.

An application can increase the capacity of an ArrayList instance before adding a large number of elements using the ensureCapacity operation. Performs the given action for each element of the Iterable until all elements have been processed or the action throws an exception.

Cours java : table des matières

Returns an iterator over coirs elements in this list in proper sequence. Returns an array containing all of the elements in this list in proper sequence from first to last element ; the runtime type of the returned array is that arralyist the specified nava. Note that the fail-fast behavior of an iterator cannot be guaranteed as it is, generally speaking, impossible to make any hard guarantees in the presence of unsynchronized concurrent modification.

Inserts the specified element at the specified position in this list. Returns the element at the specified position in this list. The new elements will appear in the list in the order that they are returned by the specified collection’s iterator. Description copied from interface: This class is a member of the Java Collections Framework.

The list will be empty after this call returns. This method acts as bridge between array-based and collection-based APIs.

ciurs This is best done at creation time, to prevent accidental unsynchronized access to the list: Constructs a list containing the elements of the specified collection, in the order they are returned by the collection’s iterator.


The returned array will be “safe” in that no references to it are maintained by this list. The specified index indicates the first element that would be returned by an initial call to next. More formally, returns the highest index i such that Objects. Shifts any subsequent elements to the left subtracts one from their indices.

The caller is thus free to modify the returned array. Errors or runtime exceptions thrown during iteration or by the predicate are relayed to the clurs.

Therefore, it would be wrong to write a program that depended on this exception for its correctness: The constant factor ararylist low compared to that for the LinkedList implementation. Note that this implementation is not synchronized. This implies that the behavior of this call is undefined if the specified collection is this list, and this list is nonempty. If fromIndex and toIndex are equal, the returned list is empty.

In other words, this method must allocate a new array.