tictactoe

Class TicTacToe

java.lang.Object

tictactoe.TicTacToe

public class TicTacToe
extends java.lang.Object

Method Summary

Modifier and Type	Method and Description
static boolean	boardFull(java.lang.String[][] board) Is the board completely full of x and o moves?
static java.lang.String[][]	genBoard() Generate an initial board
static boolean	makeMove(java.lang.String player, java.lang.String[][] board, int row, int col) Record a move of the player at the row and column.
static java.lang.String	prettyString(java.lang.String[][] board) Returns a standard view of the current board
static void	verifyValidCol(int col) Check that the col is between 0 and 2, inclusively, throwing IllegalArgumentException if not.
static void	verifyValidPlayer(java.lang.String player) Check that the specified player is "x" or "o" and throw an IllegalArgumentException if it is not.
static void	verifyValidRow(int row) Check that the row is between 0 and 2, inclusively, throwing IllegalArgumentException if not.
static boolean	winFor(java.lang.String player, java.lang.String[][] board) Does the board contain a win for the player? If it does, this method must return true even if the board also contains a win for the other player.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

genBoard

public static java.lang.String[][] genBoard()

Generate an initial board

Returns:

a 3x3 String[][] array with each element set to a single blank string (" ").

verifyValidPlayer

public static void verifyValidPlayer(java.lang.String player)

Check that the specified player is "x" or "o" and throw an IllegalArgumentException if it is not.

Parameters:

player - should be "x" or "o"

verifyValidRow

public static void verifyValidRow(int row)

Check that the row is between 0 and 2, inclusively, throwing IllegalArgumentException if not.

Parameters:

row - should be between 0 and 2, inclusively

verifyValidCol

public static void verifyValidCol(int col)

Check that the col is between 0 and 2, inclusively, throwing IllegalArgumentException if not.

Parameters:

col - should be between 0 and 2, inclusively

prettyString

public static java.lang.String prettyString(java.lang.String[][] board)

Returns a standard view of the current board

Parameters:

board - the current 3x3 tic tac toe board

Returns:

a String that looks like a tic tac toe board

makeMove

public static boolean makeMove(java.lang.String player,
                               java.lang.String[][] board,
                               int row,
                               int col)

Record a move of the player at the row and column. You must

• Make sure the player is valid (call verifyValidPlayer(java.lang.String))
• Make sure the row and column are valid (call verifyValidRow(int) and verifyValidCol(int))
• Make sure the board has no move at the row and column. In other words, it should have just a single space there. If the board already has a move there, return false.
• Record the move at the row and column by storing the player String at board[row][col], and return true.

Parameters:

player - an "x" or an "o"

board - a 3x3 String[][] array

row - an integer between 0 and 2 inclusively

col - an integer between 0 and 2 inclusively

Returns:

true iff the move was successful

boardFull

public static boolean boardFull(java.lang.String[][] board)

Is the board completely full of x and o moves?

Parameters:

board - a 3x3 String[][] array

Returns:

true iff the board is full

winFor

public static boolean winFor(java.lang.String player,
                             java.lang.String[][] board)

Does the board contain a win for the player? If it does, this method must return true even if the board also contains a win for the other player.

Parameters:

player - An "x" or "o". Any other input should throw an IllegalArgumentException

board - A 3x3 String[][] array

Returns:

true iff the board contains some win for the specified player