Java Programing laungage

One dimensional array is a list of variables of same type that are accessed by a common name. An individual variable in the array is called an array element. Arrays forms a way to handle groups of related data. A one-dimensional array is a linear list of elements of the same type. To create an array, first you must declare an array variable of required type.

1. Declare the Array

Syntax:

type array-name[]; // no memory allocation takes place in declaration

or

type []array-name;

Where type defines the data type of array element like int, double etc.

array-name is the name of array.

Note: That declaration does not actually create an array. it only declares a reference.

2. Allocation Memory for its Elements

In java, initialize an array can be done by using new keyword.

Syntax:

array-name=new type[Size] //Size must be a constant or a variable

Note:All the elements of array will be automatically initialized to zero.

Array index start with zero.

Example : This example shows how to declare initialize and display an array.

// Declaration of allocating memory to an array
int a[]  = new int[3];

// Initializing elements
a[0] = 1;
a[1] = 2;
a[2] = 3;

//Display array elements
System.out.println(a[0]); 
System.out.println(a[1]); 
System.out.println(a[2]); 

// Or Use for loop to display elements
 for (int i = 0; i < a.length; i = i + 1) 
{
       System.out.print(a[i]);  
       System.out.print(" ");
 }

Example :

class Array
{
	public static void main(String args[])
	{
		int a[]={10,20,30,40,50};
		for(int i=0;i<a.length;i++)
		 System.out.println(a[i]);		
	}
}

Output :

10
20
30
40
50