05. Matrix shuffling

package Uprajnenie;

import java.util.Scanner;

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


        // Read matrix dimensions
        int rows = scanner.nextInt();
        int cols = scanner.nextInt();
        scanner.nextLine(); // Consume newline

        // Read the matrix
        String[][] matrix = new String[rows][cols];
        for (int i = 0; i < rows; i++) {
            String[] rowValues = scanner.nextLine().split("\\s+");
            for (int j = 0; j < cols; j++) {
                matrix[i][j] = rowValues[j];
            }
        }

        // Perform operations
        while (true) {
            String command = scanner.nextLine();
            if (command.equals("END")) {
                break;
            }

            String[] tokens = command.split("\\s+");
            if (tokens.length != 5 || !tokens[0].equals("swap")) {
                System.out.println("Invalid input!");
                continue;
            }

            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]);

                if (!isValidCell(matrix, row1, col1) || !isValidCell(matrix, row2, col2)) {
                    System.out.println("Invalid input!");
                    continue;
                }

                String temp = matrix[row1][col1];
                matrix[row1][col1] = matrix[row2][col2];
                matrix[row2][col2] = temp;

                printMatrix(matrix);
            } catch (NumberFormatException | ArrayIndexOutOfBoundsException e) {
                System.out.println("Invalid input!");
            }
        }
    }

    // Method to check if a cell is valid
    private static boolean isValidCell(String[][] matrix, int row, int col) {
        return row >= 0 && row < matrix.length && col >= 0 && col < matrix[0].length;
    }

    // Method to print the matrix
    private static void printMatrix(String[][] matrix) {
        for (String[] row : matrix) {
            for (String cell : row) {
                System.out.print(cell + " ");
            }
            System.out.println();
        }
    }
}