Java programming Tic Tac Toe

Question

I need help with a java program that allows two users to play tic-tac-toe. The game should print out the board after each player enters their move, check to make sure the player enters a valid move, and check to see if a player has won, or if there is a tie. The program should be written using a 2-D array. thanks

Answer 1

import java.util.Scanner;

class TicTacToe

{

class Cell

{

protected char ch;

public Cell() { ch='?'; }

public void SetX() { ch='X'; }

public void SetO() { ch='O'; }

public void Clear() { ch = '?'; }

public char Get() { return(ch); }

}

protected Cell[][] A;

public TicTacToe ()

{

A = new Cell[3][3];

for (int iloop=0; iloop<3; iloop++)

{

for (int jloop=0; jloop<3; jloop++)

{

A[iloop][jloop]= new Cell();

}

}

}

public char IndexerGetAtIndex( int iRow, int iColumn )

{

char chReturn=0;

if ((iRow>=0) && (iRow<3))

{

if ((iColumn>=0) && (iColumn<3))

{

chReturn = A[iRow][iColumn].Get();

}

}

return(chReturn);

}

public void IndexerSetXatIndex(int iRow, int iColumn)

{

if ((iRow>=0) && (iRow<3))

{

if ((iColumn>=0) && (iColumn<3))

{

A[iRow][iColumn].SetX();

}

}

}

public void IndexerSetOatIndex(int iRow, int iColumn)

{

if ((iRow>=0) && (iRow<3))

{

if ((iColumn>=0) && (iColumn<3))

{

A[iRow][iColumn].SetO();

}

}

}

public void IndexerClearIndex(int iRow, int iColumn)

{

if ((iRow>=0) && (iRow<3))

{

if ((iColumn>=0) && (iColumn<3))

{

A[iRow][iColumn].Clear();

}

}

}

public void Display()

{

for (int iloop=0; iloop<3; iloop++)

{

for (int jloop=0; jloop<3; jloop++)

{

char curChar = A[iloop][jloop].Get();

if (curChar=='?')

{

System.out.print((iloop*3+jloop+1) + " " );

}

else

{

System.out.print(A[iloop][jloop].Get() + " " );

}

}

System.out.println("");

}

}

//returns 0 if no win, 1 on row #1 win, 2 on row #2 win, 3 on row #3 win;

// -1 on column #1 win, -2 on column #2 win, -3 on column #3 win;

// 4 on diagonal win (0,0),(1,1),(2,2) win;

// -4 on digaonal win (0,2),(1,1),(2,0) win

public int CheckWin()

{

int iReturn=0;

//1st row

if ((A[0][0].Get()== A[0][1].Get()) && (A[0][1].Get()==A[0][2].Get()))

{

iReturn=1;

}

//2nd row

if ((A[1][0].Get()== A[1][1].Get()) && (A[1][1].Get()==A[1][2].Get()))

{

iReturn=2;

}

//3rd row

if ((A[2][0].Get()== A[2][1].Get()) && (A[2][1].Get()==A[2][2].Get()))

{

iReturn=3;

}

//1st column

if ((A[0][0].Get()== A[1][0].Get()) && (A[1][0].Get()==A[2][0].Get()))

{

iReturn=1;

}

//2nd column

if ((A[0][1].Get()== A[1][1].Get()) && (A[1][1].Get()==A[2][1].Get()))

{

iReturn=2;

}

//3rd column

if ((A[0][2].Get()== A[1][2].Get()) && (A[1][2].Get()==A[2][2].Get()))

{

iReturn=3;

}

//diagonal : northwest to southeast

if ((A[0][0].Get()== A[1][1].Get()) && (A[1][1].Get()==A[2][2].Get()))

{

iReturn=4;

}

//diagonal : southwest to northeast

if ((A[2][0].Get()== A[1][1].Get()) && (A[1][1].Get()==A[0][2].Get()))

{

iReturn=-4;

}

return(iReturn);

}

public void Go()

{

Scanner scanner = new Scanner(System.in);

boolean playerFlag=true;

int winResult=-1;

for (int playLoop=0; playLoop<9; playLoop++)

{

Display();

int cell=-1;

char displayChar = (playerFlag) ? 'X' : 'O';

int iRow=0,iColumn=0;

while ((cell<1) || (cell>9))

{

System.out.print("Player " + displayChar + " , please input 1-9 :>");

cell = scanner.nextInt();

cell--;

if ((cell>=0) && (cell<9))

{

iRow = cell/3;

iColumn = cell%3;

//System.out.println(" row = " +iRow + " : column = " + iColumn);

if (A[iRow][iColumn].Get()!='?')

{

System.out.println(" invalid selection ");

cell=-1;

}

else

{

break;

}

}

} //while

if (playerFlag)

{

IndexerSetXatIndex(iRow,iColumn);

}

else

{

IndexerSetOatIndex(iRow,iColumn);

}

if (playLoop>=4)

{

winResult = CheckWin();

if (winResult!=0)

{

System.out.println("Winner");

break;

}

}

playerFlag = !playerFlag;

} //for playLoop

if (winResult==0) { System.out.println(" TIE "); }

}

public static void main(String args[])

{

TicTacToe t = new TicTacToe();

t.Go();

}

}