Tic Tac Toe in Java

A simple tic tac toe program in Java.

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Program Listing

TicTacT.java

import java.util.Scanner;

class TicTacT {

// Array to hold the X or O in each space (Default value: '_')
public static char[] place = { '_','_','_','_','_','_','_','_','_' };

// Holds X or O, whichever team user chooses
public static char team = '_';

// Holds X or O, whichever team user does NOT choose!
public static char opp = '_';

// Variable to hold user input for Scanner
public static String usrStr;

public static void main (String[] args) {

// Greeting message for user
System.out.println("WELCOME TO TIC TAC TOE!");

// Run the setup method
setup();

}

public static void drawBoard() {

// Draw the game board
System.out.println("\n\t    A   B   C");
System.out.println("\t  .-----------.");
System.out.println("\t1 |_"+TicTacT.place[0]+"_|_"+TicTacT.place[1]+"_|_"+TicTacT.place[2]+"_|\n");
System.out.println("\t2 |_"+TicTacT.place[3]+"_|_"+TicTacT.place[4]+"_|_"+TicTacT.place[5]+"_|\n");
System.out.println("\t3 |_"+TicTacT.place[6]+"_|_"+TicTacT.place[7]+"_|_"+TicTacT.place[8]+"_|");
System.out.println("\t  '-----------'");

}

public static void setup() {

// Loop to reset the game board
for ( int i = 0 ; i < 9 ; i++ ) {

TicTacT.place[i] = '_';

}

// Print the game board to the console
drawBoard();

while ( (TicTacT.team != 'X') && (TicTacT.team != 'O') ) {

System.out.println("\n\nSelect Your Team! Enter 'X' or 'O' below...");

System.out.print("Enter your selection: ");
Scanner input = new Scanner(System.in);
TicTacT.usrStr = input.next();

if (TicTacT.usrStr.toUpperCase().equals("X")) {

TicTacT.team = 'X';
TicTacT.opp = 'O';

} else if (TicTacT.usrStr.toUpperCase().equals("O")) {

TicTacT.team = 'O';
TicTacT.opp = 'X';

} else {

System.out.println("You entered: " + usrStr);
System.out.println("This is not a valid option.");
System.out.println("Please enter either an X or an O to continue.");

}

}

System.out.println("\nYou are team " + TicTacT.team + "!");

// Run the game method
game();

}

public static void game() {

// Local variable to run loop
boolean loop = true;

System.out.println("IT'S YOUR TURN!");

drawBoard();

do {

System.out.println("\n\nChoose a column and row to place an " + TicTacT.team + ". (EXAMPLE: A1)\n");

System.out.print("Enter your selction: ");
Scanner input = new Scanner(System.in);
TicTacT.usrStr = input.next().toUpperCase();

switch (TicTacT.usrStr)
{
case "A1" : if (TicTacT.place[0]=='_') {

TicTacT.place[0] = TicTacT.team;
System.out.println("\nYou place an " + TicTacT.team + " in A1");
oppMove();
loop = false;

} else if (TicTacT.place[0]==TicTacT.team) {

System.out.println("\nThere is an " + TicTacT.team + " there already!");

} else if (TicTacT.place[0]==TicTacT.opp) {

System.out.println("\nThis space is already taken!");

}; break;

case "B1" : if (TicTacT.place[1]=='_') {

TicTacT.place[1] = TicTacT.team;
System.out.println("\nYou place an " + TicTacT.team + " in B1");
oppMove();
loop = false;

} else if (TicTacT.place[1]==TicTacT.team) {

System.out.println("\nThere is an " + TicTacT.team + " there already!");

} else if (TicTacT.place[1]==TicTacT.opp) {

System.out.println("\nThis space is already taken!");

}; break;

case "C1" : if (TicTacT.place[2]=='_') {

TicTacT.place[2] = TicTacT.team;
System.out.println("\nYou place an " + TicTacT.team + " in C1");
oppMove();
loop = false;

} else if (TicTacT.place[2]==TicTacT.team) {

System.out.println("\nThere is an " + TicTacT.team + " there already!");

} else if (TicTacT.place[2]==TicTacT.opp) {

System.out.println("\nThis space is already taken!");

}; break;

case "A2" : if (TicTacT.place[3]=='_') {

TicTacT.place[3] = TicTacT.team;
System.out.println("\nYou place an " + TicTacT.team + " in A2");
oppMove();
loop = false;

} else if (TicTacT.place[3]==TicTacT.team) {

System.out.println("\nThere is an " + TicTacT.team + " there already!");

} else if (TicTacT.place[3]==TicTacT.opp) {

System.out.println("\nThis space is already taken!");

}; break;

case "B2" : if (TicTacT.place[4]=='_') {

TicTacT.place[4] = TicTacT.team;
System.out.println("\nYou place an " + TicTacT.team + " in B2");
oppMove();
loop = false;

} else if (TicTacT.place[4]==TicTacT.team) {

System.out.println("\nThere is an " + TicTacT.team + " there already!");

} else if (TicTacT.place[4]==TicTacT.opp) {

System.out.println("\nThis space is already taken!");

}; break;

case "C2" : if (TicTacT.place[5]=='_') {

TicTacT.place[5] = TicTacT.team;
System.out.println("\nYou place an " + TicTacT.team + " in C2");
oppMove();
loop = false;

} else if (TicTacT.place[5]==TicTacT.team) {

System.out.println("\nThere is an " + TicTacT.team + " there already!");

} else if (TicTacT.place[5]==TicTacT.opp) {

System.out.println("\nThis space is already taken!");

}; break;

case "A3" : if (TicTacT.place[6]=='_') {

TicTacT.place[6] = TicTacT.team;
System.out.println("\nYou place an " + TicTacT.team + " in A3");
oppMove();
loop = false;

} else if (TicTacT.place[6]==TicTacT.team) {

System.out.println("\nThere is an " + TicTacT.team + " there already!");

} else if (TicTacT.place[6]==TicTacT.opp) {

System.out.println("\nThis space is already taken!");

}; break;

case "B3" : if (TicTacT.place[7]=='_') {

TicTacT.place[7] = TicTacT.team;
System.out.println("\nYou place an " + TicTacT.team + " in B3");
oppMove();
loop = false;

} else if (TicTacT.place[7]==TicTacT.team) {

System.out.println("\nThere is an " + TicTacT.team + " there already!");

} else if (TicTacT.place[7]==TicTacT.opp) {

System.out.println("\nThis space is already taken!");

}; break;

case "C3" : if (TicTacT.place[8]=='_') {

TicTacT.place[8] = TicTacT.team;
System.out.println("\nYou place an " + TicTacT.team + " in C3");
oppMove();
loop = false;

} else if (TicTacT.place[8]==TicTacT.team) {

System.out.println("\nThere is an " + TicTacT.team + " there already!");

} else if (TicTacT.place[8]==TicTacT.opp) {

System.out.println("\nThis space is already taken!");

}; break;
}

} while (loop);

checkWin();

}

public static void oppMove() {

while (true) {

if ( (TicTacT.place[0]=='_') || (TicTacT.place[1]=='_') || (TicTacT.place[2]=='_') || (TicTacT.place[3]=='_') || (TicTacT.place[4]=='_') || (TicTacT.place[5]=='_') || (TicTacT.place[6]=='_') || (TicTacT.place[7]=='_') || (TicTacT.place[8]=='_') ) {

float rn = (float) Math.random();
float m = rn * 8;
int x = Math.round(m);

if (TicTacT.place[x]=='_') {

TicTacT.place[x] = TicTacT.opp;
break;

}

} else { checkWin(); break; }

}

}

public static void checkWin() {

// See if X has won the game

if ( (TicTacT.place[0]=='X') && (TicTacT.place[1]=='X') && (TicTacT.place[2]=='X') ) {

System.out.println("\n\n\n\tX WINS!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");

} else if ( (TicTacT.place[3]=='X') && (TicTacT.place[4]=='X') && (TicTacT.place[5]=='X') ) {

System.out.println("\n\n\n\tX WINS!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");

} else if ( (TicTacT.place[6]=='X') && (TicTacT.place[7]=='X') && (TicTacT.place[8]=='X') ) {

System.out.println("\n\n\n\tX WINS!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");

} else if ( (TicTacT.place[0]=='X') && (TicTacT.place[3]=='X') && (TicTacT.place[6]=='X') ) {

System.out.println("\n\n\n\tX WINS!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");

} else if ( (TicTacT.place[1]=='X') && (TicTacT.place[4]=='X') && (TicTacT.place[7]=='X') ) {

System.out.println("\n\n\n\tX WINS!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");

} else if ( (TicTacT.place[2]=='X') && (TicTacT.place[5]=='X') && (TicTacT.place[8]=='X') ) {

System.out.println("\n\n\n\tX WINS!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");

} else if ( (TicTacT.place[0]=='X') && (TicTacT.place[4]=='X') && (TicTacT.place[8]=='X') ) {

System.out.println("\n\n\n\tX WINS!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");

} else if ( (TicTacT.place[6]=='X') && (TicTacT.place[4]=='X') && (TicTacT.place[2]=='X') ) {

System.out.println("\n\n\n\tX WINS!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");
}

// Now, see if O has won!

if ( (TicTacT.place[0]=='O') && (TicTacT.place[1]=='O') && (TicTacT.place[2]=='O') ) {

System.out.println("\n\n\n\tO WINS!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");

} else if ( (TicTacT.place[3]=='O') && (TicTacT.place[4]=='O') && (TicTacT.place[5]=='O') ) {

System.out.println("\n\n\n\tO WINS!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");

} else if ( (TicTacT.place[6]=='O') && (TicTacT.place[7]=='O') && (TicTacT.place[8]=='O') ) {

System.out.println("\n\n\n\tO WINS!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");

} else if ( (TicTacT.place[0]=='O') && (TicTacT.place[3]=='O') && (TicTacT.place[6]=='O') ) {

System.out.println("\n\n\n\tO WINS!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");

} else if ( (TicTacT.place[1]=='O') && (TicTacT.place[4]=='O') && (TicTacT.place[7]=='O') ) {

System.out.println("\n\n\n\tO WINS!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");

} else if ( (TicTacT.place[2]=='O') && (TicTacT.place[5]=='O') && (TicTacT.place[8]=='O') ) {

System.out.println("\n\n\n\tO WINS!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");

} else if ( (TicTacT.place[0]=='O') && (TicTacT.place[4]=='O') && (TicTacT.place[8]=='O') ) {

System.out.println("\n\n\n\tO WINS!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");

} else if ( (TicTacT.place[6]=='O') && (TicTacT.place[4]=='O') && (TicTacT.place[2]=='O') ) {

System.out.println("\n\n\n\tO WINS!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");

// Check for a tie!

} else if ( (TicTacT.place[0]!='_') && (TicTacT.place[1]!='_') && (TicTacT.place[2]!='_') && (TicTacT.place[3]!='_') && (TicTacT.place[4]!='_') && (TicTacT.place[5]!='_') && (TicTacT.place[6]!='_') && (TicTacT.place[7]!='_') && (TicTacT.place[8]!='_') ) {

System.out.println("\n\n\n\tTIE GAME!!!!"); drawBoard(); playAgain(); System.out.println("\n\n");

// If no one has won and no tie, keep playing!!

} else { game(); }

}

public static void playAgain() {

System.out.print("\n\nPlay again? [y/n]: ");
Scanner input = new Scanner(System.in);
TicTacT.usrStr = input.next().toLowerCase();

if (usrStr.equals("y")) {

TicTacT.team = '_';
TicTacT.opp = '_';
setup();

} else {

System.exit(0);

}

}


}