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Tic-Tac-Toe Game in Java
package net.javaguides.springboot;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.Scanner;
/**
* Tic-Tac-Toe game in Java
* @author https://www.javaguides.net/
*
*/
public class TicTacToe {
private static String[] board = new String[9];
private static String turn = "A";
public static void main(String[] args) {
String winner = null;
populateEmptyBoard();
System.out.println("Welcome to 2 Player Tic Tac Toe.");
System.out.println("--------------------------------");
printBoard();
System.out.println("A's will play first. Enter a slot number to place A in:");
try (Scanner in = new Scanner(System.in)) {
while (winner == null) {
int numInput;
try {
numInput = in .nextInt();
if (!(numInput > 0 && numInput <= 9)) {
System.out.println("Invalid input; re-enter slot number:");
continue;
}
} catch (InputMismatchException e) {
System.out.println("Invalid input; re-enter slot number:");
continue;
}
if (board[numInput - 1].equals(String.valueOf(numInput))) {
board[numInput - 1] = turn;
if (turn.equals("A")) {
turn = "B";
} else {
turn = "A";
}
printBoard();
winner = checkWinner();
} else {
System.out.println("Slot already taken; re-enter slot number:");
continue;
}
}
if (winner.equalsIgnoreCase("draw")) {
System.out.println("It's a draw! Thanks for playing.");
} else {
System.out.println("Congratulations! " + winner + "'s have won! Thanks for playing.");
}
}
}
static String checkWinner() {
for (int a = 0; a < 8; a++) {
String line = null;
switch (a) {
case 0:
line = board[0] + board[1] + board[2];
break;
case 1:
line = board[3] + board[4] + board[5];
break;
case 2:
line = board[6] + board[7] + board[8];
break;
case 3:
line = board[0] + board[3] + board[6];
break;
case 4:
line = board[1] + board[4] + board[7];
break;
case 5:
line = board[2] + board[5] + board[8];
break;
case 6:
line = board[0] + board[4] + board[8];
break;
case 7:
line = board[2] + board[4] + board[6];
break;
}
if (line.equals("AAA")) {
return "A";
} else if (line.equals("BBB")) {
return "B";
}
}
for (int a = 0; a < 9; a++) {
if (Arrays.asList(board).contains(String.valueOf(a + 1))) {
break;
} else if (a == 8)
return "draw";
}
System.out.println(turn + "'s turn; enter a slot number to place " + turn + " in:");
return null;
}
private static void printBoard() {
String createBoard = "/---|---|---\\ \n" + "| " + board[0] + " | " + board[1] + " | " + board[2] + " | \n" +
"|-----------| \n" + "| " + board[3] + " | " + board[4] + " | " + board[5] + " | \n" +
"|-----------| \n" + "| " + board[6] + " | " + board[7] + " | " + board[8] + " | \n" +
"/---|---|---\\ \n";
System.out.println(createBoard);
}
private static void populateEmptyBoard() {
for (int a = 0; a < 9; a++) {
board[a] = String.valueOf(a + 1);
}
}
}
Welcome to 2 Player Tic Tac Toe.
--------------------------------
/---|---|---\
| 1 | 2 | 3 |
|-----------|
| 4 | 5 | 6 |
|-----------|
| 7 | 8 | 9 |
/---|---|---\
A's will play first. Enter a slot number to place A in:
1
/---|---|---\
| A | 2 | 3 |
|-----------|
| 4 | 5 | 6 |
|-----------|
| 7 | 8 | 9 |
/---|---|---\
B's turn; enter a slot number to place B in:
2
/---|---|---\
| A | B | 3 |
|-----------|
| 4 | 5 | 6 |
|-----------|
| 7 | 8 | 9 |
/---|---|---\
A's turn; enter a slot number to place A in:
4
/---|---|---\
| A | B | 3 |
|-----------|
| A | 5 | 6 |
|-----------|
| 7 | 8 | 9 |
/---|---|---\
B's turn; enter a slot number to place B in:
5
/---|---|---\
| A | B | 3 |
|-----------|
| A | B | 6 |
|-----------|
| 7 | 8 | 9 |
/---|---|---\
A's turn; enter a slot number to place A in:
7
/---|---|---\
| A | B | 3 |
|-----------|
| A | B | 6 |
|-----------|
| A | 8 | 9 |
/---|---|---\
Congratulations! A's have won! Thanks for playing.
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