2D ARRAYS
Hey guys, we are back with another blog in java and today we are gonna talk
about 2D arrays in java. So we are acknowledged with arrays in java but today
we will see that how can we create a 2D one. So what are 2D arrays in java?
Basically, arrays which consists of rows and columns are known as 2D arrays.
With the help of 2D arrays we can create a matrix in our code, lest solve
matrix related problems. Now let us see how can we declare a 3D array and store
values inside it.
Initializing of a 2D array:
For declaration of a 2D array we can follow the general syntax given below
type arrayName[][]
= new type [size of row in INT][size of column in INT];
int ar[][]= new int[3][2];
So basically in the above declaration we have declared a 2D array or a
matrix which has 3 rows and 2 columns. Firstly let's see how can we initialize
the 2D array directly in our code:
import java.util.Scanner;
public class Two_D_Arrays {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int ar[][]= {
{ 1, 2 },
{ 3, 4 },
{ 5, 6 },
};
//printing
the 2d array
for(int i=0; i<3; i++)
{
for(int j=0;j<2; j++) {
System.out.print(ar[i][j]+" ");
}
System.out.println("");
}
}
}
OUTPUT:
1 2
3 4
5 6
Now we will see how can we use two loops to get elements as inputs for our
3X2 matrix, below is the code for taking
the input and then printing out the
whole matrix.
import java.util.Scanner;
public class Two_D_Arrays {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int ar[][]= new int[3][2];
int temp=0;
//Taking user
input for the array
/*the loop will will take the
inputs for the following indexes
ar[0][0]
ar[0][1]
ar[1][0] ar[1][1]
ar[2][0] ar[2][1]
*/
for(int i=0; i<3; i++)
{
for(int j=0;j<2; j++) {
ar[i][j]=sc.nextInt();
}
}
//printing
the 2d array
for(int i=0; i<3; i++)
{
for(int j=0;j<2; j++) {
System.out.print(ar[i][j]+" ");
}
System.out.println("");
}
}
}
OUTPUT:
1 2
3 4
5 6
Note that the output is printed in a way that it actually represents a
matrix of order 3X2 i.e., 3 rows and 2 columns.
That's it for today guys, in our upcoming blogs we will learn about the memory allocations regarding arrays. Till then keep reading, keep coding!
