1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
package com.mavlushechka.tictactoe;
import com.mavlushechka.tictactoe.exceptions.IncorrectCoordinatesDiapasonException;
import com.mavlushechka.tictactoe.exceptions.OccupiedCellException;
import java.util.Scanner;
public final class TicTacToe {
private static final char FIRST_PLAYER = 'X';
private static final char SECOND_PLAYER = 'O';
private final char[][] cells = {{' ', ' ', ' '}, {' ', ' ', ' '}, {' ', ' ', ' '}};
private char currentPlayer = FIRST_PLAYER;
private boolean gameFinished = false;
private Character winner;
public void startGame() {
greet();
showCells();
enterCell();
}
private void greet() {
System.out.printf("""
Tic-tac-toe is a paper-and-pencil game for two players
who take turns marking the spaces in a three-by-three grid with %c or %c.
The player who succeeds in placing three of their marks in a
horizontal, vertical, or diagonal row is the winner.
When all 9 squares are full, the game is over.
First player is %c. Players must enter the y and x coordinates separated by a space.
""", FIRST_PLAYER, SECOND_PLAYER, FIRST_PLAYER);
}
private void showCells() {
System.out.println("---------");
for (char[] oneLineCells : cells) {
System.out.print("| ");
for (char cell : oneLineCells) {
System.out.printf("%c ", cell);
}
System.out.print("|\n");
}
System.out.println("---------");
}
private void enterCell() {
byte y;
byte x;
String temporaryCoordinates;
System.out.printf("Player %c enter the coordinates: ", currentPlayer);
temporaryCoordinates = new Scanner(System.in).nextLine();
try {
y = Byte.parseByte(temporaryCoordinates.split(" ")[0]);
x = Byte.parseByte(temporaryCoordinates.split(" ")[1]);
if (!((y >= 1 && y <= 3) && (x >= 1 && x <= 3))) {
throw new IncorrectCoordinatesDiapasonException("Incorrect coordinates");
} else if (cells[y-1][x-1] != ' ') {
throw new OccupiedCellException("Cell is occupied");
} else {
move(--y, --x);
}
} catch (NumberFormatException numberFormatException) {
System.out.println("You should enter numbers!");
enterCell();
} catch (IncorrectCoordinatesDiapasonException incorrectCoordinatesDiapasonException) {
System.out.println("Coordinates should be from 1 to 3!");
enterCell();
} catch (OccupiedCellException occupiedCellException) {
System.out.println("This cell is occupied! Choose another one!");
enterCell();
}
}
private void move(byte y, byte x) {
cells[y][x] = currentPlayer;
currentPlayer = (currentPlayer == FIRST_PLAYER) ? SECOND_PLAYER : FIRST_PLAYER;
showCells();
checkLines();
if (!gameFinished) {
enterCell();
} else {
System.out.print(getResult());
}
}
private void checkLines() {
checkDiagonalLines();
if (gameFinished) {
return;
}
checkVerticalAndHorizontalLines();
if (gameFinished) {
return;
}
checkIfCellsAreFull();
}
private void checkDiagonalLines() {
for (byte i = 0, j = 2; i < 3; i += 2, j -= 2) {
if (cells[i][0] != ' ' && (cells[i][0] == cells[1][1] && cells[1][1] == cells[j][2])) {
gameFinished = true;
winner = cells[i][0];
break;
}
}
}
private void checkVerticalAndHorizontalLines() {
for (byte i = 0; i < 3; i++) {
if (cells[i][0] != ' ' && ((cells[i][0] == cells[i][1] && cells[i][1] == cells[i][2]) ||
cells[0][i] != ' ' && (cells[0][i] == cells[1][i] && cells[1][i] == cells[2][i]))) {
gameFinished = true;
winner = ((cells[i][0] == cells[i][1] && cells[i][1] == cells[i][2])) ? cells[i][0] : cells[0][i];
}
}
}
private void checkIfCellsAreFull() {
for (byte i = 0, fullCells = 9; i < 3; i++) {
for (byte j = 0; j < 3; j++) {
if (cells[i][j] != ' ') {
fullCells--;
}
}
if (fullCells == 0) {
gameFinished = true;
}
}
}
private String getResult() {
return winner == null ? "Draw" : "Congratulations, " + winner + " is a winner!";
}
}
final class Main {
public static void main(String[] args) {
TicTacToe ticTacToe = new TicTacToe();
ticTacToe.startGame();
}
}
|
