Array
Array is a referenced type of data type in java, it is used to create fixed number of multiple variables of same type to store multiple values of similar type in contiguous memory locations with single variable name. In java following are the important points in java:
Need of Array
In java array is used to collect similar type of values or objects to send all those multiple values with single call from one method to another methods either as an argument or as a return value.
Limitation of Array
Array size is fixed, means we cannot increase or decrease its size after its creation.
Types of Array
There are two types of array in java1. One-Dimensional Arrays
2. Multi-Dimensional Arrays
One-Dimensional Arrays
Ex: int arr[]=new int[5];
class ArrayDemoc
{
public static void main (String[] args)
{
// declares an Array of integers.
int[] arr;
// allocating memory for 5 integers.
arr = new int[5];
// initialize the elements of the array
arr[0] = 10;
arr[1] = 20;
arr[2] = 30;
arr[3] = 40;
arr[4] = 50;
// accessing the elements
for (int i = 0; i < arr.length; i++)
System.out.println("Element at index " + i + " : "+ arr[i]);
}
}
O/P
Element at index 0 : 10 Element at index 1 : 20 Element at index 2 : 30 Element at index 3 : 40 Element at index 4 : 50
Multi-Dimensional Arrays
> By specifying [] more than once we can achieve multi dimensional array.Ex: int arr[][]=new int[5][5];
class MultiArrayDemo
{
public static void main(String args[])
{
// declaring and initializing 2D array
int arr[][] = { {1,2,3},{4,6,5},{8,5,6} };
// printing 2D array
for (int i=0; i< 3 ; i++)
{
for (int j=0; j < 3 ; j++){
System.out.print(arr[i][j] + " ");
}
System.out.println();
}
}
}
O/P1 2 3 4 6 5 8 5 6