print spiral matrix

gistfile1.txt

public class App {

    public static void main(String[] args) {
        int n = 5; // input size
        int[][] matrix = new int[n][n];
        int count = 1;
        int top = 0, bottom = n - 1, left = 0, right = n - 1;

        while (top <= bottom && left <= right) {
            // Print top row
            for (int i = left; i <= right; i++) {
                matrix[top][i] = count++;
            }
            top++;

            // Print right column
            for (int i = top; i <= bottom; i++) {
                matrix[i][right] = count++;
            }
            right--;

            // Print bottom row
            if (top <= bottom) {
                for (int i = right; i >= left; i--) {
                    matrix[bottom][i] = count++;
                }
                bottom--;
            }

            // Print left column
            if (left <= right) {
                for (int i = bottom; i >= top; i--) {
                    matrix[i][left] = count++;
                }
                left++;
            }
        }

        // Print the matrix
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                System.out.printf("%2d ", matrix[i][j]);
            }
            System.out.println();
        }
    }

}