I am a noob to Java and i have to build this TicTacToe program. It doesn't need GUI or anything, juts a grid on a terminal. I don't have much yet. can anyone help me? I got the board part, but i am confused on how to assign a certain string like "X" or "O" to a coordinate of a 3by3 arrray and getting it to display in the board...can someone help me?
This is all i have so far, i don't get it at all.
// tic tac toe game
import java.util.Scanner;
public class TicTacToe
{
public static String board [][] = new String [3][3];
public static void main(String[] args)
{
Scanner input = new Scanner( System.in );
int boxNumber;
String name1;
String name2;
int turn = 0;
System.out.println ( "*******************************" );
for ( int gameBoard = 0; gameBoard != 3; gameBoard++ )
{
for ( int gameBoard2 = 0; gameBoard2 != 5; gameBoard2++ )
{
System.out.println ( "* * * *" );
}
System.out.println ( "*******************************" );
}
System.out.println( "Enter Player1's name: " );
name1 = input.nextLine();
System.out.println( "Enter Player2's name: " );
name2 = input.nextLine();
System.out.printf( "%s, please choose a box to place your mark.", name1 );
boxNumber = input.nextInt();
You are off to a good start. I don't know how much you know about programming in general; apologies if I say something obvious.
For a simple program like this, it's not really necessary, but Java programmers usually put their programs in packages by inserting the statement
package packagename;
at the start of the program.
Also, you should comment your code and use more descriptive variable names. For example, before your first System.out.println statement, you could write the comment
// Draw Tic-Tac-Toe grid
Your variable names "gameBoard" and "gameBoard2" don't make sense, since they are integers, not game boards: for ( int gameBoard2 = 0; gameBoard2 != 5; gameBoard2++ ). Instead, it is customary to use the names i and j for variables in for-loops which can't have a specific description.
Now for the TicTacToe game algorithm:
I won't actually give you code; you really learn from thinking it through yourself.
Some ideas: First, the program must set up variables. You have already done this by declaring variables and prompting for names.
I suggest you create a char variable currentUser, initialized to whichever character (X or O) you want to go first.
After that, the program needs to repeatedly do the following:
1. Prompt current user for move
2. Display game board
3. Check if current user has won. (This is the condition that allows the program to terminate.)
What does this look like? A loop: it executes repeatedly until the condition becomes false. For the condition, you should write another static function that tests whether someone has won. You could use a while loop or a do loop.
You will need to switch the player between turns. You can do this with the line
currentUser = (currentUser == 'X' ? 'O' : 'X');
(If you are not familiar with the ? : operator, it is a shorthand way of writing:
if( currentUser == 'X' )
currentUser = 'O';
else
currentUser = 'X';
).
http://java.sun.com/docs/books/tutorial/ is a useful resource for learning how to use many Java language features.
If you need to look up how to use a specific function/class, see http://java.sun.com/javase/6/docs/api/index.html and click on the appropriate package name in the main pane.
Best wishes.
Thank you very much. You have given me some really helpful hints. The way to change between users solved one of my biggest problems. However, i am quite confused on how to make a lable for the box to appear inside the box and have X/O appear the same way, i tried piecing multiple small boxes together, like so:
System.out.println ( "*******" );
for ( int gameBoard = 0; gameBoard != 1; gameBoard++ )
{
for ( int gameBoard2 = 0; gameBoard2 != 3; gameBoard2++ )
{
System.out.printf ( "* %d *\n", boxNumber );
}
System.out.println ( "*******" );
}
In this case, i mad boxNumber a integer that equals to 1, but how can i piece 9 boxes together and have differen boxes display different numbers without using 9 different variables? I would use an 3by3 array, but i am not sure how to utilize that either.
> yes, but one step at a time
I agree. Do and test one step at a time.
> I can;t get that board to happen.
To happen? Step 1 define:
class Board {
}
Or is that too object-oriented?
i have this segment of code
for (boxNumber = 1; boxNumber <= 9; boxNumber++)
{
System.out.println ( "*******" );
for ( int gameBoard = 0; gameBoard != 1; gameBoard++ )
{
for ( int gameBoard2 = 0; gameBoard2 != 3; gameBoard2++ )
{
System.out.printf ( "* %d *\n", boxNumber );
}
System.out.println ( "*******" );
}
}
It does what i want, except it displays them like this:
*******
* 1 *
* 1 *
* 1 *
*******
*******
* 2 *
* 2 *
* 2 *
*******
*******
* 3 *
* 3 *
* 3 *
*******
*******
* 4 *
* 4 *
* 4 *
*******
*******
* 5 *
* 5 *
* 5 *
*******
*******
* 6 *
* 6 *
* 6 *
*******
*******
* 7 *
* 7 *
* 7 *
*******
*******
* 8 *
* 8 *
* 8 *
*******
*******
* 9 *
* 9 *
* 9 *
*******
not side-by-side
Impossible? There's actually a theoretical result that any partially recusive
function can be written with exactly one loop!
Anyway, do what ever seems more natural to you. This occurs to me.
Think of the board as having three rows and three columns of cells, and
the cell being made up of some number of lines of text:
for every row
for every line on that row
for every col on that row
print that line for that cell
next
start a new line
next
next
There are many ways of doing this. Play around with your code until it works. It's not rocket science, it's a tic-tac-toe board.
I can't get it...it's just weird, i was never good with loops and i'm just more confused now.
I can't even get it to display horizontally so i can use three loops to do it. it's just messed up...
Let's move on to a different part of the problem.or can we if i don't have the board?
I'm pretty sure that i'll get the code going once i get the concepts on how to construct this program.
Someone PLZPLZ help me....i am really dying here.
TicTacToe.java
public class TicTacToe
{
public TicTacToe()
{
board = new String[ROWS][COLUMNS];
// Fill with spaces
for (int i = 0; i < ROWS; i++)
for (int j = 0; j < COLUMNS; j++)
board[i][j] = " ";
}
public void set(int i, int j, String player)
{
if (board[i][j].equals(" "))
board[i][j] = player;
}
public String toString()
{
String r = "";
for (int i = 0; i < ROWS; i++)
{
r = r + "|";
for (int j = 0; j < COLUMNS; j++)
r = r + board[i][j];
r = r + "|\n";
}
return r;
}
private String[][] board;
private static final int ROWS = 3;
private static final int COLUMNS = 3;
}
TicTacToeTester
import java.util.Scanner;
public class TicTacToeTester
{
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
String player = "x";
TicTacToe game = new TicTacToe();
boolean done = false;
while (!done)
{
System.out.print(game.toString());
System.out.print(
"Row for " + player + " (-1 to exit): ");
int row = in.nextInt();
if (row < 0) done = true;
else
{
System.out.print("Column for " + player + ": ");
int column = in.nextInt();
game.set(row, column, player);
if (player.equals("x"))
player = "o";
else
player = "x";
}
}
}
}
heh. Aight. Actually I really would appreciate it if you could comment on my implementation of MVC, Dr. (I want to know if I'm "doing it right" or at least "close to right") If you don't mind looking over the 218 lines or so.
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class TicTacToe
{
public static void main(String[] args)
{
controller c = new controller();
model m = new model();
view v = new view(c);
v.setModel(m);
c.setModel(m);
c.setView(v);
m.addModelListener(v);
v.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
interface modelListener extends EventListener
{
void modelChanged(modelChangedEvent e);
}
class modelChangedEvent extends EventObject
{
int changedX;
int changedY;
int player;
Object source;
public modelChangedEvent(model m)
{
super(m);
}
public model getModel()
{
return (model) super.getSource();
}
public void setChanged(int x, int y)
{
changedX = x;
changedY = y;
}
public void setPlayer(int p)
{
player = p;
}
public int getX()
{
return changedX;
}
public int getY()
{
return changedY;
}
public int getP()
{
return player;
}
public void setSource(Object o)
{
source = o;
}
public Object getSource()
{
return source;
}
}
class model
{
EventListenerList list = new EventListenerList();
modelChangedEvent event = new modelChangedEvent(this);
int grid[][] = new int[3][3];
int currentPlayer = 1; // 1 for X, 2 for O
public model()
{
for (int i = 0; i < 3; i++)
for (int j = 0; j < 3; j++)
grid[i][j] = 0;
}
public void addModelListener(modelListener l)
{
list.add(modelListener.class, l);
}
public void removeModelListener(modelListener l)
{
list.remove(modelListener.class, l);
}
public void fireEvent()
{
Object[] listeners = list.getListenerList();
for (int i = listeners.length - 2; i >= 0; i -= 2)
{
if (listeners[i] == modelListener.class)
{
((modelListener)listeners[i+1]).modelChanged(event);
}
}
}
public void placePiece(int x, int y)
{
grid[x][y] = currentPlayer;
event.setChanged(x,y);
event.setPlayer(currentPlayer);
currentPlayer = currentPlayer % 2 + 1;
fireEvent();
}
public boolean testWin(int player)
{
boolean winFlag = false;
for (int i = 0; i < 3; i++)
{
if (grid[i][0] == grid[i][1] && grid[i][0] == grid[i][2] && grid[i][0] == player)
winFlag = true;
if (grid[0][i] == grid[1][i] && grid[0][i] == grid[2][i] && grid[0][i] == player)
winFlag = true;
}
if (grid[0][0] == grid[1][1] && grid[0][0] == grid[2][2] && grid[1][1] == player)
winFlag = true;
if (grid[0][2] == grid[1][1] && grid[0][2] == grid[2][0] && grid[1][1] == player)
winFlag = true;
return winFlag;
}
public void actionButton(JButton b)
{
event.setSource(b);
}
}
class view extends JFrame implements modelListener
{
model m;
public view(controller l)
{
setTitle("Tic Tac Toe!");
setLayout(new GridLayout(3,3));
for (int i = 0; i < 9; i++)
{
JButton b = new JButton("");
b.addActionListener(l);
b.setActionCommand(String.valueOf(i));
b.setPreferredSize(new Dimension(70,70));
b.setMargin(new Insets(0,0,0,0));
add(b);
}
pack();
setVisible(true);
}
public void setModel(model m)
{
this.m = m;
}
public void modelChanged(modelChangedEvent e)
{
JButton src = (JButton) e.getSource();
int player = e.getP();
if (player == 1)
src.setText("X");
else if (player == 2)
src.setText("O");
else
;
src.setEnabled(false);
if (m.testWin(player))
{
System.out.println("Player " + player + " wins!");
System.exit(0);
}
}
}
class controller implements ActionListener
{
model m;
view v;
public void setModel(model m)
{
this.m = m;
}
public void setView(view v)
{
this.v = v;
}
public void actionPerformed(ActionEvent e)
{
JButton b = (JButton) e.getSource();
m.actionButton(b);
int i = Integer.parseInt(e.getActionCommand());
m.placePiece(i % 3, i / 3);
}
}
To FastMike, thank you very much, it is a great help, i will modle my code after part of yours.
To JJCoolB, thank you for your 218 line long code, i don't mind, just give me a second to find the section for checking winners.
To DrLasloJamf, nice prediction, you r right.
Thanks everyone!
If i encounter any problems, i will ask for help again...lol, bet u guys r tired of me right about now...i'm such a noob at this...
// java final project
// tic tac toe game
import java.util.Scanner;
public class TicTacToe
{
public static String board [][] = new String [3][3];
public static void main(String[] args)
{
Scanner input = new Scanner( System.in );
int boxNumber;
String name1;
String name2;
String current = "X";
int choice;
int box = 0;
System.out.println( "Enter Player1's name: " );
name1 = input.nextLine();
System.out.println( "Enter Player2's name: " );
name2 = input.nextLine();
for ( int i = 0; i < 3; i++)
{
for ( int j = 0; j < 3; j++)
{
board[i][j] = " ";
}
}
System.out.println();
System.out.println ( "******************" );
for (boxNumber = 1; boxNumber <= 3; boxNumber++)
{
for ( int row = 0; row < 1; row++ )
{
for ( int column = 0; column < 3; column++ )
{
System.out.printf ( "****\n" );
}
System.out.println ( "******************" );
}
}
int winner = 0;
int display = 0;
while (winner == 0)
{
while ( display == 0)
{ // start of while loop
System.out.println();
System.out.println ( "******************" );
for (boxNumber = 1; boxNumber <= 3; boxNumber++)
{
for ( int row = 0; row < 1; row++ )
{
for ( int column = 0; column < 3; column++ )
{
System.out.printf ( "****\n" );
}
System.out.println ( "******************" );
}
}
System.out.printf( "%s, make your move.", name1 );
choice = input.nextInt();
if ( choice <= 0 || choice > 9 )
{
System.out.printf( "%s, can't do that homey.", name1 );
choice = input.nextInt();
}
else
{
xmark(choice);
if (current == ("X"))
{
current = "O";
System.out.println();
System.out.println ( "******************" );
for (boxNumber = 1; boxNumber <= 3; boxNumber++)
{
for ( int row = 0; row < 1; row++ )
{
for ( int column = 0; column < 3; column++ )
{
System.out.printf ( "****\n" );
}
System.out.println ( "******************" );
}
}
System.out.printf( "%s, make your move.", name2 );
omark(choice);
}
else
current = "X";
}
}//end of loop
}
}
public static void xmark ( int x )
{
int thingy = x;
switch ( thingy )
{
case 1:
board[0][0] = "X";
break;
case 2:
board[0][1] = "X";
break;
case 3:
board[0][2] = "X";
break;
case 4:
board[1][0] = "X";
break;
case 5:
board[1][1] = "X";
break;
case 6:
board[1][2] = "X";
break;
case 7:
board[2][0] = "X";
break;
case 8:
board[2][1] = "X";
break;
case 9:
board[2][2] = "X";
break;
}
}
public static void omark ( int o )
{
int thingy = o;
switch ( thingy )
{
case 1:
board[0][0] = "O";
break;
case 2:
board[0][1] = "O";
break;
case 3:
board[0][2] = "O";
break;
case 4:
board[1][0] = "O";
break;
case 5:
board[1][1] = "O";
break;
case 6:
board[1][2] = "O";
break;
case 7:
board[2][0] = "O";
break;
case 8:
board[2][1] = "O";
break;
case 9:
board[2][2] = "O";
break;
}
}
}//end
Guys, please help me with my code, i don't get it...i need help...please, it doesn't display the board with the X or O...please helpme.it dislays weird stuff, copy it and see for urselves...
