TicTacToe.java

import java.util.Arrays;
import java.util.Random;
import java.util.Scanner;

public class TicTacToe {
    
    static void showBoard(Character[][] board){
        System.out.println(board[0][0] + "|" + board[0][1] + "|"+ board[0][2]) ;
        System.out.println("-+-+-");
        System.out.println(board[1][0] + "|" + board[1][1] + "|"+ board[1][2]) ;
        System.out.println("-+-+-");
        System.out.println(board[2][0] + "|" + board[2][1] + "|"+ board[2][2]) ;
    }

    static void showBoard(Character[][] board, Character c, int row, int col, Boolean playersMove){

        board[row][col] = playersMove ? 'X' : 'O';
        System.out.println(board[0][0] + "|" + board[0][1] + "|"+ board[0][2]) ;
        System.out.println("-+-+-");
        System.out.println(board[1][0] + "|" + board[1][1] + "|"+ board[1][2]) ;
        System.out.println("-+-+-");
        System.out.println(board[2][0] + "|" + board[2][1] + "|"+ board[2][2]) ;
    }

    static void getPosition(int pos[], Character c){

        if(c=='1'){
            pos[0] = 0;
            pos[1] = 0;
        }
        else if(c=='2'){
            pos[0] = 0;
            pos[1] = 1;
        }
        else if(c=='3'){
            pos[0] = 0;
            pos[1] = 2;
        }
        else if(c=='4'){
            pos[0] = 1;
            pos[1] = 0;
        }
        else if(c=='5'){
            pos[0] = 1;
            pos[1] = 1;
        }
        else if(c=='6'){
            pos[0] = 1;
            pos[1] = 2;
        }
        else if(c=='7'){
            pos[0] = 2;
            pos[1] = 0;
        }
        else if(c=='8'){
            pos[0] = 2;
            pos[1] = 1;
        }
        else if(c=='9'){
            pos[0] = 2;
            pos[1] = 2;
        }

    }

    static Boolean checkBoard(Character[][] board){

        if(board[0][0]=='X' && board[0][1]=='X' && board[0][2]=='X') return true;
        if(board[1][0]=='X' && board[1][1]=='X' && board[1][2]=='X') return true;
        if(board[2][0]=='X' && board[2][1]=='X' && board[2][2]=='X') return true;
        
        if(board[0][0]=='O' && board[0][1]=='O' && board[0][2]=='O') return true;
        if(board[1][0]=='O' && board[1][1]=='O' && board[1][2]=='O') return true;
        if(board[2][0]=='O' && board[2][1]=='O' && board[2][2]=='O') return true;

        if(board[0][0]=='X' && board[1][0]=='X' && board[2][0]=='X') return true;
        if(board[0][1]=='X' && board[1][1]=='X' && board[2][1]=='X') return true;
        if(board[0][2]=='X' && board[1][2]=='X' && board[2][2]=='X') return true;

        if(board[0][0]=='O' && board[1][0]=='O' && board[2][0]=='O') return true;
        if(board[0][1]=='O' && board[1][1]=='O' && board[2][1]=='O') return true;
        if(board[0][2]=='O' && board[1][2]=='O' && board[2][2]=='O') return true;

        if(board[0][0]=='X' && board[1][1]=='X' && board[2][2]=='X') return true;
        if(board[0][0]=='O' && board[1][1]=='O' && board[2][2]=='O') return true;
        if(board[0][2]=='X' && board[1][1]=='X' && board[2][0]=='X') return true;
        if(board[0][2]=='O' && board[1][1]=='O' && board[2][0]=='O') return true;


        return false;
    }

    static boolean checkGameRunning(Boolean[] validity){
        for(int i=0; i<validity.length ;i++){
            if(validity[i]==false)return true;
        }

        return false;
    }


    public static void main(String[] args) throws InterruptedException {
        

        Character[][] board = new Character[3][3];

        int k = 0;

        char[] c = new char[9];

        String a = "123456789";

        c = a.toCharArray();

        for(int i=0; i<3; i++){

            for(int j=0; j<3; j++){
                board[i][j] = c[k];
                k++;
            }
        }

        Scanner sc = new Scanner(System.in);

        boolean gameRunning = true;

        Character PlayersMove,ComputersMove;

        Random rand = new Random();
        Integer r;
        Boolean[] validity = new Boolean[9];

        for(int i=0; i<validity.length;i++){
            validity[i] = false;
        }


        showBoard(board);
        System.out.println();

        while(gameRunning){

            System.out.print("Your Move : " );
            Character ch = ' ';
            Integer move ;
            Boolean validInput = false;

            while(validInput != true){
                move = sc.nextInt();
                if(move<1 || move>9){
                    System.out.println("Input should be between 1 and 9 : ");
                }
                else if(validity[move-1]==false){
                    validInput = true;
                    validity[move-1] = true;
                    ch = Character.forDigit(move, 10);
                    break;
                }
                else{
                    System.out.print("Give Proper Input : ");
                }
                
            }

            int pos[] = new int[2]; //pos[0] = row, pos[1] = column

            getPosition(pos, ch);
            showBoard(board,'X',pos[0],pos[1],true);
            System.out.println();


            Boolean checker = checkBoard(board);

            if(checker==true){
                System.out.println("You Won!!!!!!!");
                break;
            }

            gameRunning = checkGameRunning(validity);

            if(gameRunning == false){
                System.out.println("DRAW !!!");
                break;
            }

            System.out.print("Computer's Move : ");
            Thread.sleep(1000);
            validInput = false;

            while(validInput != true){
                r = rand.nextInt(9) + 1;

                if(validity[r-1]==false){
                    System.out.println(r);
                    ch = Character.forDigit(r, 10);
                    validInput = true;
                    validity[r-1] = true;
                    break;
                }
                
            }

            getPosition(pos,ch );
            System.out.println();
            showBoard(board,'O',pos[0],pos[1],false);
            System.out.println();

            checker = checkBoard(board);

            if(checker==true){
                System.out.println("You Lost :(");
                break;
            }

            gameRunning = checkGameRunning(validity);

            if(gameRunning == false){
                System.out.println("DRAW !!!");
                break;
            }

        }

    }
}