SpiralPattern.java

import java.util.*;

class Spiral Pattern 
{
	static int R = 4;
	static int C = 4;

	static void print(int arr[][], int i, int j, int m, int n)
	{
		// If i or j lies outside the matrix
		if (i >= m || j >= n) 
    {
			return;
		}

		// Print First Row
		for (int p = i; p < n; p++) 
    {
			System.out.print(arr[i][p] + " ");
		}

		// Print Last Column
		for (int p = i + 1; p < m; p++) 
    {
			System.out.print(arr[p][n - 1] + " ");
		}

		// Print Last Row, if Last and
		// First Row are not same
		if ((m - 1) != i) 
    {
			for (int p = n - 2; p >= j; p--) 
      {
				System.out.print(arr[m - 1][p] + " ");
			}
		}

		// Print First Column, if Last and
		// First Column are not same
		if ((n - 1) != j) 
    {
			for (int p = m - 2; p > i; p--) 
      {
				System.out.print(arr[p][j] + " ");
			}
		}
		print(arr, i + 1, j + 1, m - 1, n - 1);
	}

	public static void main(String[] args)
	{
		int a[][] = { { 1, 2, 3, 4 },
					{ 5, 6, 7, 8 },
					{ 9, 10, 11, 12 },
					{ 13, 14, 15, 16 } };
    
		print(a, 0, 0, R, C);
	}
}