9 - Les tableaux en Java

Arrays
An array is a container object that holds a fixed number of values of a single type. The length of an array is established when the array is created. After creation, its length is fixed. You have seen an example of arrays already, in the main method of the "Hello World!" application. This section discusses arrays in greater detail.
Illustration of an array as 10 boxes numbered 0 through 9; an index of 0 indicates the first element in the array
An array of 10 elements.
Each item in an array is called an element, and each element is accessed by its numerical index. As shown in the preceding illustration, numbering begins with 0. The 9th element, for example, would therefore be accessed at index 8.
The following program, ArrayDemo, creates an array of integers, puts some values in the array, and prints each value to standard output.
In a real-world programming situation, you would probably use one of the supported looping constructs to iterate through each element of the array, rather than write each line individually as in the preceding example. However, the example clearly illustrates the array syntax. You will learn about the various looping constructs --for, while, and do-while-- in the Control Flow section.
Declaring a Variable to Refer to an Array
The preceding program declares an array --named anArray-- with the following line of code:
// declares an array of integers
int---- anArray;
Like declarations for variables of other types, an array declaration has two components: the array's type and the array's name. An array's type is written as type----, where type is the data type of the contained elements; the brackets are special symbols indicating that this variable holds an array. The size of the array is not part of its type --which is why the brackets are empty--. An array's name can be anything you want, provided that it follows the rules and conventions as previously discussed in the naming section. As with variables of other types, the declaration does not actually create an array; it simply tells the compiler that this variable will hold an array of the specified type.