Write a method that checks whether the diagonal joining the upper-left and the lower-right corners of a tic-tac-toe board are all the same.

public class TicTacToe { /** * Return true if all elements on the diagonal joining the upper-left * and the lower-right corners all the same. * @param board a 3 x 3 array of String * @return true if all elements are the same. */ public static boolean checkUpperLeftToLowerRight(String[][] board) {

/* Your code goes here */

} }