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Exercise08_20.java
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package ch_08;
import java.util.*;
/**
* ***8.20 (Game: connect four) Connect four is a two-player board game in which the
* players alternately drop colored disks into a seven-column, six-row vertically
* suspended grid, as shown below.
* The objective of the game is to connect four same-colored disks in a row, a column, or a diagonal before your opponent can do likewise. The program prompts
* two players to drop a red or yellow disk alternately. In the preceding figure, the
* red disk is shown in a dark color and the yellow in a light color. Whenever a disk
* is dropped, the program will redisplay the board on the console and determines the
* status of the game (win, draw, or continue).
* <p>
* Here is a sample run:
* | | | | | | | |
* | | | | | | | |
* | | | | | | | |
* | | | | | | | |
* | | | | | | | |
* | | | | | | | |
* ———————————————
* * Drop a red disk at column (0–6): 0
* | | | | | | | |
* | | | | | | | |
* | | | | | | | |
* | | | | | | | |
* | | | | | | | |
* |R| | | | | | |
* ———————————————
* Drop a yellow disk at column (0–6): 3
* | | | | | | | |
* | | | | | | | |
* | | | | | | | |
* | | | | | | | |
* | | | | | | | |
* |R| | |Y| | | |
* . . .
* . . .
* . . .
* Drop a yellow disk at column (0–6): 6
* | | | | | | | |
* | | | | | | | |
* | | | |R| | | |
* | | | |Y|R|Y| |
* | | |R|Y|Y|Y|Y|
* |R|Y|R|Y|R|R|R|
* ———————————————
* The yellow player won
*
* @author Harry D.
*/
public class Exercise08_20 {
private static final String RED = "R";
private static final String YELLOW = "Y";
private static final String WIN = "win";
private static final String CONTINUE = "continue";
private static final String DRAW = "draw";
private static final String EMPTY = " ";
private static final String DASH = "-";
private static final String SEP = "|";
static boolean turn = true; //false is reds turn
public static void main(String[] args) {
int numMoves = 0;
String[][] board = new String[6][7];
for (String[] strings : board) {
Arrays.fill(strings, EMPTY);
}
Scanner in = new Scanner(System.in);
String result = CONTINUE; //Initialize result of a move
while (true) {
turn = !turn; //Other players turn
int move = printBoard(board, turn ? YELLOW : RED, in);
playerMove(move, board, turn ? YELLOW : RED);
result = evaluateGame(board);
if (result.equals(WIN)) {
printBoard(board);
if (turn) { // Yellow won
System.out.println("The yellow player won.");
} else { // Red Won
System.out.println("The red player won.");
}
break;
} else if (result.equals(DRAW)) {
System.out.println("The game is a draw.");
}
}
}
static void playerMove(int column, String[][] board, String player) {
for (int r = (board.length - 1); r >= 0; r--) {
String val = board[r][column];
if (val.equals(EMPTY)) {
board[r][column] = player;
break;
}
}
}
static String evaluateGame(String[][] board) {
int redPoints;
int yellowPoints = 0;
/* Check rows */
for (int r = 0; r < board.length; r++) {
redPoints = 0;
yellowPoints = 0;
for (int c = 0; c < board[r].length; c++) {
String g = board[r][c];
if (!g.equals(EMPTY)) {
if (g.equals(RED)) {
redPoints++;
yellowPoints = 0;
} else if (g.equals(YELLOW)) {
yellowPoints++;
redPoints = 0;
}
if (redPoints >= 4) {
return WIN;
} else if (yellowPoints >= 4) {
return WIN;
}
} else {
redPoints = 0;
yellowPoints = 0;
}
}
}
/* Check Columns */
for (int c = 0; c < board[0].length; c++) {
redPoints = 0;
yellowPoints = 0;
for (int r = 0; r < board.length; r++) {
String g = board[r][c];
if (!g.equals(EMPTY)) {
if (g.equals(RED)) {
redPoints++;
yellowPoints = 0;
} else if (g.equals(YELLOW)) {
yellowPoints++;
redPoints = 0;
}
if (redPoints >= 4) {
return WIN;
}
if (yellowPoints >= 4) {
return WIN;
}
} else {
redPoints = 0;
yellowPoints = 0;
}
}
}
/* Check Diagonals */
for (int r = 0; r < board.length; r++) {
for (int c = 0; c < board[r].length; c++) {
String g = board[r][c];
if (!g.equals(EMPTY)) {
if (g.equals(RED)) {
redPoints = 1;
/* Check down and right diagonal */
for (int d = 1; (r + d) < board.length && (c + d) < board[r].length; d++) {
if (board[r + d][c + d].equals(RED)) {
redPoints++;
} else {
break;
}
if (redPoints == 4) {
return WIN;
}
}
redPoints = 1;
/* Check up and right diagonal */
for (int d = 1; (r - d) >= 0 && (c + d) < board[r].length; d++) {
if (board[r - d][c + d].equals(RED)) {
redPoints++;
} else {
break;
}
if (redPoints == 4) {
return WIN;
}
}
redPoints = 1;
/* Check down and left diagonal */
for (int d = 1; (r + d) < board.length && (c - d) >= 0; d++) {
if (board[r + d][c - d].equals(RED)) {
redPoints++;
} else {
break;
}
if (redPoints == 4) {
return WIN;
}
}
redPoints = 1;
/* Check up and left diagonal */
for (int d = 1; (r - d) >= 0 && (c - d) >= 0; d++) {
if (board[r - d][c - d].equals(RED)) {
redPoints++;
} else {
break;
}
if (redPoints == 4) {
return WIN;
}
}
} else if (g.equals(YELLOW)) {
yellowPoints = 1;
/* Check down and right diagonal */
for (int d = 1; (r + d) < board.length && (c + d) < board[r].length; d++) {
if (board[r + d][c + d].equals(YELLOW)) {
yellowPoints++;
} else {
break;
}
if (yellowPoints == 4) {
return WIN;
}
}
yellowPoints = 1;
/* Check up and right diagonal */
for (int d = 1; (r - d) >= 0 && (c + d) < board[r].length; d++) {
if (board[r - d][c + d].equals(YELLOW)) {
yellowPoints++;
} else {
break;
}
if (yellowPoints == 4) {
return WIN;
}
}
yellowPoints = 1;
/* Check down and left diagonal */
for (int d = 1; (r + d) < board.length && (c - d) >= 0; d++) {
if (board[r + d][c - d].equals(YELLOW)) {
yellowPoints++;
} else {
break;
}
if (yellowPoints == 4) {
return WIN;
}
}
yellowPoints = 1;
/* Check up and left diagonal */
for (int d = 1; (r - d) >= 0 && (c - d) >= 0; d++) {
if (board[r - d][c - d].equals(YELLOW)) {
yellowPoints++;
} else {
break;
}
if (yellowPoints == 4) {
return WIN;
}
}
}
}
}
}
return CONTINUE;
}
static int printBoard(String[][] board, String player, Scanner in) {
printBoard(board);
System.out.print("Drop a " + (player.equals(RED) ? "red" : "yellow") + " disk at column (0" + DASH + "6): ");
int move = in.nextInt();
return move;
}
static void printBoard(String[][] board) {
for (String[] strings : board) {
for (String s : strings) {
System.out.print(SEP + s);
}
System.out.println(SEP);
}
System.out.println(DASH + DASH + DASH + DASH + DASH + DASH + DASH + DASH + DASH + DASH + DASH + DASH + DASH + DASH + DASH);
}
}