String[][] ticTacToe = { {"X", "O", "O"},

                            {"O", "X", "X"},

                            {"X", "O", "X"}};

   System.out.println(Arrays.deepToString(ticTacToe));

Here's the output:

         [java] [[X, O, O], [O, X, X], [X, O, X]]

There are similar methods:
- Arrays.deepHashCode
- Arrays.deepEquals

Arrays.deepToString()

Java