Array in Java

An array is a collection of similar data types.
Array is a container object that hold values of homogenous type. It is also known as static data structure because size of an array must be specified at the time of its declaration.
Index of array starts from zero to size-1.
An array can be either primitive or reference type. It gets memory in heap area
An array is a collection of multiple elements which has same type of data.
Array stores homogeneous (same data type) data contiguously in memory, and that too under one variable name, i.e. single name is assigned to the entire array elements.
It stores either all integers or all floating point numbers or all characters.
An array is a data structure used to process multiple elements with the same data type when a number of such elements are known.
Arrays form an important part of almost all-programming languages.
It provides a powerful feature and can be used as such or can be used to form complex data structures like stacks and queues.
An array can be defined as an infinite collection of homogeneous(similar type) elements.
This means that an array can store either all integers, all floating point numbers, all characters, or any other complex data type, but all of same type.
Arrays are always stored in consecutive memory locations.

Features of Array

Flow Diagram of Array

Array Declaration

datatype identifier[];
        OR
 datatype[] identifier;

Example

int[] a;
float[] a;
char[] a;
short[] a;
int[][] a;

We used new operator to initialize an array.

int a[] =new int[5];
or
int a[]={2,3,4,5,6};

In arrays, we can access the specific element by its index within square brackets.

store[1]=5;

Multidimensional arrays are arrays of arrays.
Two dimensional arrays are also called table or matrix, two dimensional arrays have two subscripts.
Two dimensional array inwhich elements are stored column by column is called as column major matrix.
Two dimensional array in which elements are stored row by row is called as row majo rmatrix.
First subscript denotes number of rows and second subscript denotes the number of columns.
The simplest form of the Multi Dimensionl Array is the Two Dimensionl Array. A Multi Dimensionl Array is essence a list of One Dimensionl Arrays.

int a[][] =new int[4][5];
or
int[][] a={{2,3,4,5,6}{7,8,9,10,1}};

For specifying both row and column in array,index start with 0.

arrayname[n-1][m-1];

arrayname[2][3]=5;