This was asked as an interview question.
Design a tic tac toe using object oriented principles. The interviewer said he is not interested in the logic and he wants only the design. I gave the design as below but I was not completely satisfied. Please let me know if there are any suggestions/improvements.
The interviewer was very particular about two things
- The game can be played for n x n squares.
- The games rules should be separate from the rest of the application.
My approach :
- Tic tac toe is a board game (Game object, Board object)
- Board consists of an Array of Squares (Square object)
- Squares can be marked as X or O.
- Two players play the game( Human and Computer classes implements Player interface)
- Once X or O is placed, the GameEngine (GameEngine object) decides if the game is over(draw or the player won) or it's still on
- If the game is still on, the other player is given his turn.
- For the Computer player , GameEngine figures out where to locate the next piece.
Rough sketch of classes.
interface Player {
Player takeTurn();
void markNextBox();
}
.
public class TicTacToeGameEngine implements GameRule{
@Override
public Boolean isWinner(Game game) {
// Check winner logic
return false;
}
@Override
public Square locateSquareToMark(Game game) {
List<Square> squares= game.getBoard().getFilledSquares();
//go through the list of squares and figure out a square to mark
return square;
}
}
.
public class Computer implements Player {
GameRule g = new TicTacToeGameEngine();
@Override
public void markNextBox() {
g.locateSquareToMark(game);
}
@Override
public Player takeTurn() {
// TODO Auto-generated method stub
return null;
}
}
.
public interface GameRule {
Boolean isWinner(Game game);
Square locateSquareToMark(Game game);
}
//Similar implementation for Human
Now the difficulties I found in this design is
- Does the Player need to know about the GameEngine ?
- How to pass on the control to the next player if the game is still on. (How to implement takeTurn() )
- I initially decided that the Game object should hold the state. If you look at the Computer class, I pass the game object to the GameEngine. Is it good to do it here? I feel something better can be done about it.
Any flaws, improvements to design will be appreciated.
GameEngine.allGameInstances();
Game gamePort = GameWorld.class.getPipeline();
if(gameEngine.getGameCount() == 0){
if(gameState == GameTypes.Matherlight){
Game gameGameGame = new Game(gamePanelGame, empGame, gameDisplayPlayer);
if(gameGameObject == null) return null;
if(gamePlayerState == GameDistribution.TEST) {
GameObject gameObject = new GameObject();
gameObject.HADOOP_IS_1000_STAGE = 1;
gameObject.drawgrch when -1 to day.GameObjectInvolve(game);
gameObjectObject.start();
gameObject.wonderingGameState = gameObject em isGameObject regards.getGameObject().getGameColor();*/
}
game.game.closures().run();
}
}
public class player {
void init() {
game = new Game();
}
}
public class GameObject : Game
{
public public Game(){
setDefaultStlCommand(FLAG_EXIT);
}
public void DoGame(){
gamePanel.trouble();
}
};
If you want your application simply call start() (which is linked completion] called to add a button and create a new one, I suggest would call the "start" method of that scene like below
// Execute the method @ Frame
public void start() {
((GameButton)getApplication()).addButton(Components.classes[0]);
}
Swift snippet:
import uikit
import otherButton as Button
class MyButton: uibutton {
btnAddButton: function(button) {
self. treat button button in the em
}
}
class Button: (uibutton, buttonView) -> Void
var button1 = uibutton allButtons
var button2 = uibutton()
I' ve worked out what 600x800px would be there but it may not be just a structure of what you want to do.
You stated. In GameWorld's almost everything you have to layer, you just use GameEngine.createGame
with value 3
.
If you they call that code while then in constructor code of Game.class
you will need a constructor(which could be all the two ways of doing it) but that way it should you debug and use enhance or own instance path ?
Code is:
public class howGame extends System.Math.System.Point<double, int> {
FormCollection playerCollection;
viewsCollection();
private jframe _jframe;
private howTabAndOptions(NoreferrerOptions optionPane) {
this.optionOption = optionOption;
that.preferredCapacity = v.defaultDimension;
this.useLater = true;
items.SetNecessary(null);
}
public void SetItem(double button isnullTimer, short snippetController, string actionName, Action action)
{
boolean success = false;
bool isEnabled = true;
if (netHelper == new KeyValuePair<bool, BENEFIT>(filterKey))
{
action action action actionType = actionType;
}
else
{
return return return returnParam;
}
}
public void Reset(object value)
{
if (input.IsChecked)
{
if if if ifinputValue.Equals(value))
{ { { {
if if if if ifvalue != value)
{ { { { {
Image.Write(number);
6 6 6 6 6 6 Target.Parameters.Add(new Integer(0), value, new ID((bool)value));
else else else else
{ { { {
if if if if ifimageExpression.Position.Equals(Math.Pad(element, DoubleMath.Max)))
{ { { { {
Image.SetFalse(imageName, new Rectangle(0, 0, GROUND_WIDTH + 1, timeout, defaultImgWidth, "#" + value));
5 5 5 5 5 5
} } } }
}
}
}
since you are on IE 8, the exact same thing you elsewhere could bind to, lets the documentation asks the shared
and set the styled_ToolbarDimensions
attributes to authenticated elements. When clicking the member of the Like_Iframe you that project will set the value for the HelloWorld CLASS property only to match your source file's use font. (I suspect that the font really contains a StaticResource
, thus you run into a problem, but I had to reflection in the code for that.)
Anyway, so we your real code is what somether does implements the property you defined. In the PropertyManager
constructor, you've in their create like so:
string getFavoriteFollowedText = flagNameSuffix == null ? "" : "";
to
leftSelectorLeastCharacters.Value = "yes"
eg, disadvantage :
const bool isSuitableTextToArebackground = false;
int withBeenIncludes = startGetsInHeader.ToLowerCase();
var expectedSymbols = By.NameOfServer(iterableStr);
Alternatively, you can simply use MethodInvoker
to obtain an live String
from redirect from dispatcher to your ajax request:
if (textBox1.IsAuthenticated)
{
var request = _responseBuilder.Translate(parameterName, isdescriptions, false, "url");
}
If you do not use HttpContext.Current.Request.Host
in your MVC project, you could take a look to the docs on Rxjs documentation.
You're actually replacing the current full label with a particular error message initSession. I find away with your code that just like this:
if (v.getName().equals("beans"))
{
// Do stuff
}
You can also check the content of a variable by name, like below:
if (v.getName().contains("th2"))
{
// Check my carefully to see if the variable I want to update fires differently
// Make sure to assume a "a" orhioden variable
if (System.currentTimeMillis() < .5)
j = 0; // Check cells
else
g =0; // Could be something else
}
{
// '' won't be.
}
...
bool allMessages = false; // True.
if (sessionLevel == 401)
{
string query = "SET recentTypes = '" + 256 + "' " + 'SELECT * FROM users WHERE access1 = ' + cachedValues.array1;
for (String name : nameValuePairs);
Xc will authenticate against multiple queries/filters. What you could provide is, if you have the values you want to map to for each of the TRAP's other than the TYPES of lastUser you should look for one of these casting,
attributes to get fields named clicked:
/* If This occurs programmatically, then we still need to change the current user. */
for (int i = 0; i < 2; i++) {
/* If you add two option at time-leaving,
do it in node.tag.
if (alterNew.columnName >= 2)
delete line.lastName;
addNew.addPermissions(new KeyPolicy());
getBasedOn().edit(i);
}
The first thing you might want to ask is to create a class (the main class, like a analysis app) and an object (a class with the schemas in it, that is applicable to the user).
Class
So just add this line:
sessionClass.addDefinedMethodPaint(container);
Your method add method call, and use Class.forName(methodName).
The solution is to replace
public void goTo(List<GameObject> gameObjects);
public class GameMM {
public static void main(final String[] args) {
videoUI.run(Screen.running,
Game.PT, purelyInitializer);
}
}
Connect to the DO
GamePlayer adapter = new GameSolid("Board");
Game networkAt=new Game(defaultG.get());
hitJar.connect(avgName.charAt(0));
mainProgram.sendMethod(ListPlayer::getHref);
buttonINFLATER = new BUTTON("Removedialog", PLAY_GAME);
gameBrowser.start();
Now let's say we use IonicApp
. For the framework version the BookApp
have an event called drawButton
. So we have a method to disableAll
on the Ctx
;
AbstractLikeButton.strategy.init()
Let's call it ToggleButtonHandler
, and have it beenSelectedButtons(Canvas)
You should be using a different "interface" to determine whether the they're not shown or visible.
They have good information about recursive structures, forms, functions etc. ol.rect
You can cast this fine, serving the keys and component sites, trying to control that through types of items in string format, such as #"#Question #1, #1, ..." Looking for SERVER.TRACE and SWITCH and APP.STATEMENTS #3 give you a guest on DB APACHE. IoC is querying for best practices for generics or places where no repeat problem is available, and anyway how clause gives you in compilation. Latest Number of openComputer and WinEx
There is some sort of about activity model using declaration of the generated classes, with setClickType(String name)
and setTag
methods of the following other String
objects.
Example:
String name = mAnotherName[1];
System.out.println("this title refers to " + name + " checker.");
You can clearly see backwards while defining the sets in a flag in the asynchronous program. You could use error handling to do it. Note that registerCareMethods has called NotifyMore found that the `doWork()` object is responsible for executing the logic for the loadComplete event. Depending on what criteria we only need to get fourth, is that the next operation is placeListenerSubstr and then that will still result in a "You have meets the second condition." The native method will explicitly telling yourself how many requests are met but cache the beginning. Without a background thread session, the data will be driven as a single consumer. That means that thisInstanceState might always be non-blocking the client side app on the same id in that handling. Suspend or position tell how the current syncIdcontext here then just makes a post to the connections that do not update the redis devices.
This question is not ideal : What RECT recommend and a SystemMotion strategy in Java?.
discarded()
overrides remove()
to avoid cleanup if already exist at the end of the handles char value[] = new char[16];
http://www.youtube.com/watch?v= M_outHomeMe2542BgB
One option should be to register the upseconds if necessary (but not all of the bit values needed need declared in the stack):
getusedBottonoSome( *feature); // cdefault or other property actually validated out
Copy/paste above superclass with the number of digits in operations

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It was generated by a neural network.