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tic_tac_toe.java
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tic_tac_toe.java
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import java.util.*;
public class TicTacToe {
static ArrayList<String> coordinates = new ArrayList<String>(); // List of positions
public static void main(String[] args) {
// Populate List
coordinates.add("A1"); coordinates.add("A2"); coordinates.add("A3");
coordinates.add("B1"); coordinates.add("B2"); coordinates.add("B3");
coordinates.add("C1"); coordinates.add("C2"); coordinates.add("C3");
// Get player names
String userX = "Player 1 (X)"; // placeholder
String userO = "Player 2 (O)"; // placeholder
userX = getNames(userX); // get player 1 name
userO = getNames(userO); // get player 2 name
// print player names and corresponding X and O
System.out.print("X:" + userX + " | ");
System.out.print("O:" + userO);
System.out.println();
// Playing grid
char [][] grid = {
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
/*0*/{' ', ' ', ' ', '1', ' ', ' ', ' ', ' ', '2', ' ', ' ', ' ', ' ', ' ', '3', ' ', ' '},
/*1*/{' ', ' ', ' ', ' ', ' ', '|', ' ', ' ', ' ', ' ', ' ', '|', ' ', ' ', ' ', ' ', ' '}, // (Row, Column)
/*2*/{'A', ' ', ' ', '-', ' ', '|', ' ', ' ', '-', ' ', ' ', '|', ' ', ' ', '-', ' ', ' '}, // A1: (2,3) A2: (2,8) A3: (2,14)
/*3*/{' ', '_', '_', '_', '_', '|', '_', '_', '_', '_', '_', '|', '_', '_', '_', '_', '_'},
/*4*/{' ', ' ', ' ', ' ', ' ', '|', ' ', ' ', ' ', ' ', ' ', '|', ' ', ' ', ' ', ' ', ' '},
/*5*/{'B', ' ', ' ', '-', ' ', '|', ' ', ' ', '-', ' ', ' ', '|', ' ', ' ', '-', ' ', ' '}, // B1: (5,3) B2: (5,8) B3: (5,14)
/*6*/{' ', '_', '_', '_', '_', '|', '_', '_', '_', '_', '_', '|', '_', '_', '_', '_', '_'},
/*7*/{' ', ' ', ' ', ' ', ' ', '|', ' ', ' ', ' ', ' ', ' ', '|', ' ', ' ', ' ', ' ', ' '},
/*8*/{'C', ' ', ' ', '-', ' ', '|', ' ', ' ', '-', ' ', ' ', '|', ' ', ' ', '-', ' ', ' '}, // C1: (8,3) C2: (8,8) C3: (8,14)
/*9*/{' ', ' ', ' ', ' ', ' ', '|', ' ', ' ', ' ', ' ', ' ', '|', ' ', ' ', ' ', ' ', ' '}};
// Print the initial grid
for(char[] row : grid) {
for (char c : row) {
System.out.print(c);
}
System.out.println();
}
// Game mechanics
boolean turn = false; // Keep track of turns
int turnCount = 0;
while (turnCount < 8) {
if (turn == false) {
turnCount++;
placeSymbol(grid, userX, 'X', userX, userO);
turn = true;
// check win for X
if (win(grid, 'X') == true) {
System.out.println(userX + " wins!");
break;
}
}
if (turn == true) {
turnCount++;
placeSymbol(grid, userO, 'O', userX, userO);
turn = false;
// check win for O
if (win(grid, 'O') == true) {
System.out.println(userO + " wins!");
break;
}
}
if (turnCount > 7) {
System.out.println("It's a tie!");
}
}
}
// Function to check if a string contains illegal characters, credit to Rohit Jain on stack overflow
public static boolean containsIllegals(String toExamine) {
String[] arr = toExamine.split("[~#@*+%{}<>\\[\\]|\"\\_^]", 2);
return arr.length > 1;
}
// Get player input for both names and store them in some variable with error checking (player 1 is X, player 2 is O)
public static String getNames(String player) {
boolean errorCheck1 = false;
boolean errorCheck2 = false;
String username = "";
Scanner console = new Scanner(System.in); // create scanner for input
System.out.println("Enter " + player + " username: "); // prompt user input for player 1
do {
username = console.nextLine(); // read user input for player 1
// Error checking
if (containsIllegals(username) == true) {
errorCheck1 = true;
System.out.println("Error: Invalid characters");
} else {
errorCheck1 = false;
}
if (username.length() > 9 || username.length() < 1) {
errorCheck2 = true;
System.out.println("Error: Maximum user length is 9, minimum user length is 1");
} else {
errorCheck2 = false;
}
} while (errorCheck1 == true || errorCheck2 == true);
return username;
}
public static void placeSymbol(char[][] grid, String user, char symbol, String userX, String userO) {
boolean errorCheck = false; // Track errors
do {
Scanner scan = new Scanner(System.in);
System.out.print(user + ", Enter your placement using the given coordinates (Format: LETTERNumber. Ex: A1): "); // Prompt player
String pos = scan.nextLine();
// Switch/Case for possible inputs
switch(pos) {
case "A1":
if (coordinates.get(0) == "A1") { // Check if coordinate is taken
grid[2][3] = symbol;
coordinates.set(0, " "); // Remove coordinate from possible choices
errorCheck = false;
} else {
System.out.println("This coordinate is taken");
errorCheck = true;
}
break;
case "A2":
if (coordinates.get(1) == "A2") {
grid[2][8] = symbol;
coordinates.set(1, " ");
errorCheck = false;
} else {
System.out.println("This coordinate is taken");
errorCheck = true;
}
break;
case "A3":
if (coordinates.get(2) == "A3") {
grid[2][14] = symbol;
coordinates.set(2, " ");
errorCheck = false;
} else {
System.out.println("This coordinate is taken");
errorCheck = true;
}
break;
case "B1":
if (coordinates.get(3) == "B1") {
grid[5][3] = symbol;
coordinates.set(3, " ");
errorCheck = false;
} else {
System.out.println("This coordinate is taken");
errorCheck = true;
}
break;
case "B2":
if (coordinates.get(4) == "B2") {
grid[5][8] = symbol;
coordinates.set(4, " ");
errorCheck = false;
} else {
System.out.println("This coordinate is taken");
errorCheck = true;
}
break;
case "B3":
if (coordinates.get(5) == "B3") {
grid[5][14] = symbol;
coordinates.set(5, " ");
errorCheck = false;
} else {
System.out.println("This coordinate is taken");
errorCheck = true;
}
break;
case "C1":
if (coordinates.get(6) == "C1") {
grid[8][3] = symbol;
coordinates.set(6, " ");
errorCheck = false;
} else {
System.out.println("This coordinate is taken");
errorCheck = true;
}
break;
case "C2":
if (coordinates.get(7) == "C2") {
grid[8][8] = symbol;
coordinates.set(7, " ");
errorCheck = false;
} else {
System.out.println("This coordinate is taken");
errorCheck = true;
}
break;
case "C3":
if (coordinates.get(8) == "C3") {
grid[8][14] = symbol;
coordinates.set(8, " ");
errorCheck = false;
} else {
System.out.println("This coordinate is taken");
errorCheck = true;
}
break;
default:
System.out.println("Invalid Coordinate");
errorCheck = true;
}
} while (errorCheck == true); // Will continue to run as long as errors are present
// print player names and corresponding X and O
System.out.print("X:" + userX + " | ");
System.out.print("O:" + userO);
System.out.println();
// Print new grid
for(char[] row : grid) {
for (char c : row) {
System.out.print(c);
}
System.out.println();
}
}
public static boolean win(char[][] grid, char symbol) {
// Top Row Win
if (grid[2][3] == symbol && grid[2][8] == symbol && grid[2][14] == symbol) {
return true;
}
// Mid Row Win
if (grid[5][3] == symbol && grid[5][8] == symbol && grid[5][14] == symbol) {
return true;
}
// Bot Row Win
if (grid[8][3] == symbol && grid[8][8] == symbol && grid[8][14] == symbol) {
return true;
}
// First Col Win
if (grid[2][3] == symbol && grid[5][3] == symbol && grid[8][3] == symbol) {
return true;
}
// Second Col Win
if (grid[2][8] == symbol && grid[5][8] == symbol && grid[8][8] == symbol) {
return true;
}
// Third Col Win
if (grid[2][14] == symbol && grid[5][14] == symbol && grid[8][14] == symbol) {
return true;
}
// Top-Bot Diagonal Win
if (grid[2][3] == symbol && grid[5][8] == symbol && grid[8][14] == symbol) {
return true;
}
// Bot-Top Diagonal Win
if (grid[8][3] == symbol && grid[5][8] == symbol && grid[2][14] == symbol) {
return true;
}
return false;
}
}