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);
}
}
}
