Spiral Matrix question

import java.util.*.;

public class SpiralMatrix {
    public static List<Integer> spiralOrder(int[][] matrix) {
        List<Integer> result = new ArrayList<>();
        
        if (matrix.length == 0) {
            return result;
        }

        int top = 0;
        int bottom = matrix.length - 1;
        int left = 0;
        int right = matrix[0].length - 1;

        while (top <= bottom && left <= right) {
            for (int i = left; i <= right; i++) {
                result.add(matrix[top][i]);
            }
            top++;

            for (int i = top; i <= bottom; i++) {
                result.add(matrix[i][right]);
            }
            right--;

            if (top <= bottom) {
                for (int i = right; i >= left; i--) {
                    result.add(matrix[bottom][i]);
                }
                bottom--;
            }

            if (left <= right) {
                for (int i = bottom; i >= top; i--) {
                    result.add(matrix[i][left]);
                }
                left++;
            }
        }

        return result;
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("Enter number of rows: ");
        int rows = scanner.nextInt();
        System.out.print("Enter number of columns: ");
        int cols = scanner.nextInt();

        int[][] matrix = new int[rows][cols];
        
        System.out.println("Enter matrix elements row by row:");
        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                matrix[i][j] = scanner.nextInt();
            }
        }

        List<Integer> spiralOrder = spiralOrder(matrix);
        System.out.println("Spiral Order:");
        for (int i=0;i<spiralOrder.size();i++) {
            System.out.print(spiralOrder.get(i)+ " ");
        }
        scanner.close();
    }
}