Array in Java

 Array in Java

• It is a collection of data of same data type.
• It is used to store group of data simultaneously.
• It can store data of same data type means an integer array can store only integer value ,character array can store only character value and so on.
• We can not fetch data from array directly therefore we use index point.
• The indexing of array always start with 0.
• Index value is always an integer number.
• Array may be of any data type like int,char,float etc.

Syntax: 

• Here a is the name of array.
• int is the data type of array.
• Size of array is 5 means we can store maximum 5 values in this array.

Initialization of array method 1:

 int ar[]={45,23,89,12,78};

 Initialization of array method 2:

int a[]=new int[5];
  a[0]=45;
  a[1]=23;
  a[2]=89;
  a[3]=12;
  a[4]=78; 

 Printing of array element method 1:

class Easy
{
 public static void main(String[] args) 
 {
  //array declaration
  int ar[]={10,50,80,40,60};
   System.out.println("Value at ar[0]="+ar[0]); 
   System.out.println("Value at ar[1]="+ar[1]);
   System.out.println("Value at ar[2]="+ar[2]);
   System.out.println("Value at ar[3]="+ar[3]);
   System.out.println("Value at ar[4]="+ar[4]); 
 }
}
/*
### Output ###
Value at ar[0]=10
Value at ar[1]=50
Value at ar[2]=80
Value at ar[3]=40
Value at ar[4]=60
*/

Printing of array element method using loop:

class Easy
{
 public static void main(String[] args) 
 {
  //array declaration
  int ar[]={10,50,80,40,60};
  for(int i=0;i<=4;i++)
   System.out.println("Value at ar["+i+"]="+ar[i]);
 }
}
/*
### Output ###
Value at ar[0]=10
Value at ar[1]=50
Value at ar[2]=80
Value at ar[3]=40
Value at ar[4]=60
*/

User Input in Array:

import java.util.Scanner;
class Easy
{
 public static void main(String[] args) 
 {
  Scanner in=new Scanner(System.in);
  //array declaration
  int ar[]=new int[5];
  int i;
  for(i=0;i<=4;i++)
  {
   System.out.println("Enter element at "+(i+1));
   ar[i]=in.nextInt();
  }
  for(i=0;i<=4;i++)
   System.out.println("Value at ar["+i+"]="+ar[i]);
 }
}
/*
### Output ###
Enter element at 1
15
Enter element at 2
25
Enter element at 3
53
Enter element at 4
10
Enter element at 5
95
Value at ar[0]=15
Value at ar[1]=25
Value at ar[2]=53
Value at ar[3]=10
Value at ar[4]=95
*/

 

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