2D array in Java

 2D 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 3x3 means we can store maximum 9 values in this array.

Initialization of array method 1:

int a[3][3]={ {40,50,60},{10,20,30},{70,80,90} };

 Initialization of array method 2:

int a[][]=new int[3][3];
a[0][0]=40;
a[0][1]=50;
a[0][2]=60;
a[1][0]=10;
a[1][1]=20;
a[1][2]=30;
a[2][0]=70;
a[2][1]=80;
a[2][2]=90; 

 Printing of array element method 1:

import java.util.Scanner;
class Easy
{
 public static void main(String[] args) 
 {
 int a[][]={{40,50,60},{10,20,30},{70,80,90}};//Initializing array
System.out.println("value at a[0][0]="+a[0][0]);
System.out.println("value at a[0][1]="+a[0][1]);
System.out.println("value at a[0][2]="+a[0][2]);
System.out.println("value at a[1][0]="+a[1][0]);
System.out.println("value at a[1][1]="+a[1][1]);
System.out.println("value at a[1][2]="+a[1][2]);
System.out.println("value at a[2][0]="+a[2][0]);
System.out.println("value at a[2][1]="+a[2][1]);
System.out.println("value at a[2][2]="+a[2][2]);
 }
}
/*
### Output ###
value at a[0][0]=40
value at a[0][1]=50
value at a[0][2]=60
value at a[1][0]=10
value at a[1][1]=20
value at a[1][2]=30
value at a[2][0]=70
value at a[2][1]=80
value at a[2][2]=90
*/

Printing of array element method using loop:

class Easy
{
 public static void main(String[] args) 
 {
 int a[][]={{40,50,60},{10,20,30},{70,80,90}};//Initializing array
 for(int i=0;i<=2;i++)
 {
   for(int j=0;j<=2;j++)
   {
    System.out.print(a[i][j]+" ");
   }
    System.out.println("");
 }
 }
}
/*
### Output ###
40 50 60 
10 20 30 
70 80 90 
*/

User Input in Array:

import java.util.Scanner;
class Easy
{
 public static void main(String[] args) 
 {
  Scanner in=new Scanner(System.in);
 int a[][]=new int[3][3];
 int i,j;
 System.out.println("Enter 9 value one by one");
 //taking input
 for(i=0;i<=2;i++)
  for(j=0;j<=2;j++)
   a[i][j]=in.nextInt();
 //printing element of array
 System.out.println("Element is given below");
 for(i=0;i<=2;i++)
 {
   for(j=0;j<=2;j++)
   {
    System.out.print(a[i][j]+" ");
   }
    System.out.println("");
 }
 }
}
/*
### Output ###
Enter 9 value one by one
4
8
2
3
7
9
2
8
1
Element is given below
4 8 2 
3 7 9 
2 8 1
*/

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