Circular matrix is a way to fill the matrix from the center towards the boundary elements in clockwise or anticlockwise manner.

Anticlockwise Circular Matrix
Write a program to accept the size of the matrix from the user and make an anticlockwise circular matrix (full the data in the matrix from the center to the boundary in an anti clock wise pattern) and print it.
To learn more about how to take input using BufferedReader in java watch the given video.
https://youtu.be/bTOMwnwpXqs
import java.util.*;
class AnticlockMatrix
{
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter the size of the matrix: ");
        int n = sc.nextInt();

        int A[][] = new int[n][n];
        int k=n*n, c1=0, c2=n-1, r1=0, r2=n-1;

        while(k>=1)
        {
            for(int i=c1;i<=c2;i++)
            {
                A[r1][i]=k--;
            }

            for(int j=r1+1;j<=r2;j++)
            {
                A[j][c2]=k--;
            }

            for(int i=c2-1;i>=c1;i--)
            {
                A[r2][i]=k--;
            }

            for(int j=r2-1;j>=r1+1;j--)
            {
                A[j][c1]=k--;
            }
            c1++;
            c2--;
            r1++;
            r2--;
        }

        System.out.println("The Circular Matrix is:");
        for(int i=0;i<n;i++)
        {
            for(int j=0;j<n;j++)
            {
                System.out.print(A[i][j]+ "\t");
            }
            System.out.println();
        }
    }
}

Output:
Enter the order : 4
The Circular Matrix is:
16 15 14 13
5 4 3 12
6 1 2 11
7 8 9 10

To learn more matrix programs click
https://java4school.com/sum-of-boundary-elements-of-a-matrix

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