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public class ConnectFour extends ConsoleProgram /* DialogProgram */{
// state variables of this object
int width = 7;
int height = 6;
char[][] board = new char[width][height];
/**
* Main loop of the program. Let players take turns entering moves until one
* player wins or the board is full, in which case the game is a draw.
*/
public void run() {
int player = 1;
println("---- 4 GEWINNT -----");
// no winner yet.
int winner = 0;
while (winner == 0 && !isFull()) {
// print the current board
printBoard();
// prompt the current player to enter a move
promptPlayerMessage(player);
// read the move from the player
int x = readInt();
// terminate when -1 is entered
if (x == -1)
System.exit(0);
// players count from 1, Java from 0
x--;
// is input in correct range?
if (x >= 0 && x < width) {
// valid move, perform it
int y = putInColumn(x, player);
if (y == -1)
// output row is full message
rowFullMessage(x);
else if (hasWon(x, y))
winner = player;
else
// next player
player = 3 - player;
} else
// invalid move
errorMessage();
}
// game has ended, either we have a winner or a draw
if (winner == 0)
drawMessage();
else
winMessage(winner);
}
/**
* Initializes the Connect Four Game
*
*/
public ConnectFour() {
init();
}
/**
* Returns the char that represents a player (i.e. x or o)
*
* @param playerNo
* number of the player, i.e. 1 or 2
* @return the char for the player
*/
public char getPlayerChar(int playerNo) {
char[] playerChars = { 'x', 'o' };
return playerChars[playerNo - 1];
}
/**
* Prints the current board For example:
* |
* |
* |
* | o x
* | o x x
* |o x x o x
* -------------
* 1 2 3 4 5 6 7
*
*/
public void printBoard() {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < height; i++) {
// start of a line
sb.append("|");
for (int j = 0; j < width; j++) {
sb.append(board[j][i]).append(' ');
}
// end of a line
sb.append('\n');
}
sb.append(" -------------\n");
sb.append(" 1 2 3 4 5 6 7");
println(sb.toString());
}
/**
* Checks whether the game is won and who won the game
*
* @return the number of the winner (i.e. 1 or 2) or 0 if no one has yet won
* the game
*/
public boolean hasWon(int x, int y) {
return (hasFourHorizontally(x, y) || hasFourVertically(x, y)
|| hasFourDiagonally(x, y));
}
/**
* Checks whether another game piece can be added
*
* @return true if the board is full
*/
public boolean isFull() {
for (int x = 0; x < width; x++)
if (board[x][0] == '_')
return false;
return true;
}
/**
* Test whether there are four gaming pieces with the given char above each
* other. Only checking column x needed as this is the only column a vertical
* four-in-a-row could have been created in this turn.
*
* @param x
* column of the last added piece
* @param y
* row of the last added piece
* @return whether their are four gaming pieces above each other
*/
public boolean hasFourVertically(int x, int y) {
//TODO implement
return false;
}
/**
* Test whether there are four gaming pieces with the given char next to each
* other. Only checking column x needed as this is the only column a horizontal
* four-in-a-row could have been created in this turn.
*
* @param x
* column of the last added piece
* @param y
* row of the last added piece
* @return whether their are four gaming pieces next to each other
*/
public boolean hasFourHorizontally(int x, int y) {
//TODO implement
return false;
}
/**
* Test whether there are 4 gaming pieces next to each other on a diagonal.
* Only checking column x needed as this is the only column a horizontal
* four-in-a-row could have been created in this turn.
*
* @param x
* column of the last added piece
* @param y
* row of the last added piece
* @return whether there are 4 gaming pieces next to each other on a diagonal
*/
public boolean hasFourDiagonally(int x, int y) {
//TODO implement
return false;
}
/**
* Initialize the board with blanks
*
*/
public void init() {
//TODO implement
}
/* messages */
private void promptPlayerMessage(int p) {
//TODO implement
System.out.println("Spielerszug "+p);
}
private void rowFullMessage(int x) {
//TODO implement
System.out.println("Die Reihe ist voll");
}
private void winMessage(int p) {
//TODO implement
System.out.println("Es gewinnt Spieler" +p);
}
private void drawMessage() {
//TODO implement
System.out.println("unentschieden keiner gewinnt ihr Affen");
}
private void errorMessage() {
//TODO implement
System.out.println("Eingabe falsch etwas stimmt nicht!!!");
}
/**
* Put a gaming piece on top of the gaming pieces in the given column by the
*/
public int putInColumn(int column, int playerNo) {
//TODO put piece of player in column
return -1;
}
/**
* Main method. This is automatically called by the environment when your
* program starts.
*
* @param args
*/
public static void main(String[] args) {
new ConnectFour().run();
}
} |
