```package warmup18;

import java.util.Arrays;

/**
 *
 * @author Delano
 */
public class TicTacToe {
    private String[][] grid;

    /**
     * This constructor will create a 3x3 grid for
     * playing TicTacToe
     */
    public TicTacToe()
    {
       grid = new String[3][3];

       for (int row = 0; row < grid.length; row++)
       {
           Arrays.fill(grid[row], " ");
       }
    }
    public static void main(String[] args)
    {
        TicTacToe myPuzzle = new TicTacToe();
        myPuzzle.makeMove(1, 1, "X"); //;grid[1][1] = "X";

        //this should cause an exception
        try{
            myPuzzle.makeMove(3, 2, "O");
        }
        catch (IllegalArgumentException exception)
        {
            System.out.println(exception.getMessage());
        }
    }// end of the main method

    /**
     * This method will receive a row, a col and the player
     * info (X or O). It will validate if the position is
     * available and set the player on the position if it
     * is available
     */
    public void makeMove(int row, int col, String player)
    {
        if (row < 0 || row > 2)
            throw new IllegalArgumentException("Row must be 0-2.");

        if (col < 0 || col > 2)
                throw new IllegalArgumentException("Column must be 0-2.");

        if (grid[row][col].equals(" "))
            grid[row][col]=player;
        else
            throw new IllegalArgumentException("["+row+"]["+col+
                                    "] is already taken.");
    }

    /**
     * This method will display the game board
     */
    public void displayGrid()
    {
       for (int row=0; row < grid.length; row ++)
       {
           for (int col=0; col < grid.length; col++)
           {
               if (col ==2)
                   System.out.printf(" %s ", grid[row][col]);
               else
                   System.out.printf(" %s |", grid[row][col]);
           } //end of column for loop
           if (row==2)
               System.out.println();
           else
               System.out.println("\n------------");
       } // end of row for loop
    }

}
```