Matrix shuffling

package MultidimensionalArrays2;

import java.util.Scanner;

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

        int rows = scanner.nextInt();
        int cols = scanner.nextInt();
        scanner.nextLine();

        String[][] matrix = new String[rows][cols];

        for (int row = 0; row < rows; row++) {
            matrix[row] = scanner.nextLine().split("\\s+");
        }

        String input = scanner.nextLine();
        while (!"END".equals(input)) {
            String[] tokens = input.split("\\s+");

            if (!"swap".equals(tokens[0])) {
                System.out.println("Invalid input!");
            } else {
                try {
                    int row1 = Integer.parseInt(tokens[1]);
                    int col1 = Integer.parseInt(tokens[2]);
                    int row2 = Integer.parseInt(tokens[3]);
                    int col2 = Integer.parseInt(tokens[4]);
                    swapValues(matrix, row1, col1, row2, col2);
                    printMatrix(matrix);
                } catch (Exception e) {
                    System.out.println("Invalid input!");
                }
            }
            input = scanner.nextLine();
        }

    }

    private static void swapValues(String[][] matrix, int row1, int col1, int row2, int col2) {
        String temporaryValue = matrix[row1][col1];
        matrix[row1][col1] = matrix[row2][col2];
        matrix[row2][col2] = temporaryValue;
    }

    static void printMatrix(String[][] matrix) {
        for (int row = 0; row < matrix.length; row++) {
            for (int col = 0; col < matrix[0].length; col++) {
                System.out.print(matrix[row][col] + " ");
            }
            System.out.println();
        }
    }

}