In the following example for a Tic-Tac-Toe game implementation, several pieces are missing or incomplete. Remember to get the computer's input and also win by getting 3 in a row vertically.

Code:

import java.util.Scanner; public class Main { // Our keyboard scanner static Scanner in = new Scanner(System.in); public static void main(String[] args) { boolean nextGame = true; while (nextGame) { // Play one game oneGame(); // Check if we want to continue System.out.print("Shall we play one more (y/n)? "); String next = in.nextLine(); if ((next.charAt(0) == 'y') || (next.charAt(0) == 'Y')) nextGame = true; else nextGame = false; } System.out.println("Goodbye!"); } public static void oneGame() { char[][] playField = {{' ',' ',' '},{' ',' ',' '},{' ',' ',' '}} ; // Game loop while (true) { printBoard(playField); getUserInput(playField); if (findWin('X',playField)) { System.out.println("Congratulations, you won!"); break; } if (findTie(playField)) { System.out.println("It's a draw!"); break; } getComputerInput(playField); if (findWin('O',playField)) { System.out.println("Better luck next time!"); break; } if (findTie(playField)) { System.out.println("It's a draw!"); break; } // Next round, show where we are printBoard(playField); } printBoard(playField); } public static void getUserInput(char[][] playField) { boolean valid = false; while (!valid) { System.out.print("Please enter your move (row and col, no space): "); String move = in.nextLine(); if (move.length() == 2) { int row = (int) move.charAt(0) - 97; int col = (int) move.charAt(1) - 49; if (((row == 0) || (row == 1) || (row == 2)) && ((col == 0) || (col == 1) || (col == 2))) { if (playField[row][col] == 0 || playField[row][col] == ' ') { playField[row][col] = 'X'; valid = true; } else { System.out.println("This field is already taken, choose another!"); } } else { System.out.println("This field is invalid!"); } } else { System.out.println("Please only enter the right code (a1,...) for the play!"); } } } public static void getComputerInput(char[][] playField) { // Computer move } public static boolean findTie(char[][] playField) { // Determine TIE condition } public static boolean findWin(char playerChar, char[][] playField) { int winSum = playField.length * (int) playerChar; int sum = 0; boolean gameOver = false; // Across for (int i = 0; i < playField.length; i++) { sum = 0; for (int j = 0; j < playField[i].length; j++) { sum += (int) playField[i][j]; } if (sum == winSum) gameOver = true; } // Diagonal (top left, low right) sum = 0; for (int i = 0, j = 0; i < playField.length && j < playField[0].length; i++, j++) { sum += (int) playField[i][j]; } if (sum == winSum) gameOver = true; return gameOver; } public static void printBoard(char[][] playField) { // Print the board System.out.println(" 1 2 3"); System.out.println(" +-----+-----+-----+"); System.out.println("a | " + playField[0][0] + " | " + playField[0][1] + " | " + playField[0][2] + " |"); System.out.println(" |-----+-----+-----|"); System.out.println("b | " + playField[1][0] + " | " + playField[1][1] + " | " + playField[1][2] + " |"); System.out.println(" |-----+-----+-----|"); System.out.println("c | " + playField[2][0] + " | " + playField[2][1] + " | " + playField[2][2] + " |"); System.out.println(" +-----+-----+-----+"); } }