Array in Java

INTRODUCTION OF ARRAY

Aaary is collection of homogenous data type. An array is defined as a sequence of object of the same data type. All the elements of an array are either of type int (Whole numbers) , or all of them are of type char, or all of them are of floating decimal point type,etc.

An array connot have a mixture of different data types as its element. In computer memory ,array elements are store in a sequence of adjacent memory blocks.

The declaration of array includes the type of array that is the type of value we are going to store in it, the array name and maximum number of elements.

Examples:

short val [200];

val [12] = 5;  

Declaration & Data Types:

Arrays have the same data types as variables, i.e., short, long, float etc. They are similar to variables: they can either be declared global or local. 

They are declared by the given syntax:

Datatype array_name [dimensions] = {element1,element2,….,element}

The declaration form of one-dimensional array is:

Data_type array_name [size];

The following declares an array called ‘numbers’ to hold 5 integers and sets the first and last elements. C arrays are always

TYPES OF ARRAY

One-Dimensional Array:

One Dimensional array are same as those used variable names. Every array given same name. The declaration of one-dimensional array takes the following form:

Array _type array_name[array_size];

We can declare arrays of any built-in type such as char, float, unsigned int, etc. In addition, we can declare arrays of user-defined types such as structures, enumerated data types, etc. Note the can declare one or more arrays in a single declaration statement. We can also mix scalar variables and arrays in a declaration statement.

Syntax:- Int a[]={};

Or

Int[] a={};

Or

Int a[] = new int a[]

Two-Dimensional Array:

A two-dimensional array (commonly called a matrix) consists of elements of the same type arranged in rows and columns. The rows and columns of a matrix are numbered starting from 0. Thus, for an array of size rows x cols, the row subscripts are in the range 0 to rows - 1 and the column subscripts are in the range 0 to cols – 1.

Syntax:-

Array_type arrry_name [rows] [cols];