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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The elements themselves are not copied. The constant factor is low compared to that for the LinkedList implementation. The list will be courw after this call returns.

Trims the capacity of this ArrayList instance to be the list’s current size. Returns the element at the specified position in this list. Returns true if this list contains the specified element.

E – the type of elements in this list All Implemented Interfaces: This is typically accomplished by synchronizing on some object that naturally encapsulates the list. Constructs an empty list with the specified initial capacity. This class is roughly equivalent to Vectorexcept that it is unsynchronized.

The capacity is the size of the array used to store the elements in the list. Note that this implementation is not synchronized.

Cours java : table des matières

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 of the specified array. The behavior of this operation is undefined if the specified collection is modified while the operation is in progress. 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.

The returned list is backed by this list, so non-structural changes javx the returned list are reflected in this list, and vice-versa.


This class is a member of the Java Collections Framework. In addition to implementing the List interface, this class provides methods to manipulate the size of the array that is used internally to store the list. Each ArrayList instance has a capacity.

ArrayList (Java SE 9 & JDK 9 )

Actions are performed in the order of iteration, if that order is specified. The returned array will be “safe” in that no references to it are maintained by this list. All elements in this list must be mutually arraypist using the specified comparator that is, c. Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.

In other words, removes from this list all of its elements that are not contained in the specified collection. The semantics of the list returned by this method become undefined if the backing list i. Any operation that expects a list can be used ararylist a range operation by passing a subList view instead of a whole list.

A structural modification is any operation that adds or deletes one or more arryalist, or explicitly resizes the backing array; merely setting the value of an element is not a structural modification. Retains only the iava in this list that are contained in the specified collection.

Cours java : table des matières

Returns a shallow copy of this ArrayList instance. Returns a list iterator over the elements in this list in proper sequence. Sorts this list according to the order induced by the specified Comparator.

This call shortens the list by toIndex – fromIndex elements. Removes the first occurrence of the specified element from this list, if it is present. Note that the fail-fast behavior of an coufs cannot be guaranteed as it is, generally speaking, impossible to make any hard guarantees in the presence of unsynchronized concurrent modification.


An application can increase the capacity of an ArrayList instance before adding a large number of elements using the ensureCapacity operation. Appends the specified element to the end of arraylits list. Inserts all of the elements in the specified collection into this list, starting at the specified position. Implements all optional list operations, and permits all elements, including null. Errors or runtime exceptions thrown during iteration or by cousr predicate are relayed to the caller.

Creates a late-binding and fail-fast Spliterator over the elements in this list. If the list does not contain the element, it is unchanged.

The sizeisEmptygetsetiteratorcoours listIterator operations run in constant time. Removes all of the cors from this list. The new elements will appear in the list in the order that they are returned by the specified collection’s iterator. Fail-fast iterators throw ConcurrentModificationException on a best-effort basis.

In other arrraylist, this method must allocate a new array. The details of the growth policy are not specified beyond the fact that adding an element has constant amortized time cost. This list must be modifiable, but need not be resizable. All of the other operations run in linear time roughly speaking. The caller is thus free to modify the returned array.

More formally, returns true if and only if this list contains at least one element e such that Objects.

If the list fits in the specified array, it is returned therein. As elements are added to an ArrayList, its capacity grows automatically. Removes all of the elements of this collection that satisfy the given predicate. This is useful in determining the length of the list only if the caller knows that the list does not contain any null elements.