Question

Program Connect Four using 2d array in java

Answer 1

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class ConnectFour {

  

private static final int boardWidth = 8;

private static final int boardHeight = 8;

int totalMovesPlayed;

int[][] board;

  

public ConnectFour(){

board = new int[boardHeight][boardWidth];

totalMovesPlayed = 0;

}

  

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

  

ConnectFour c4 = new ConnectFour();

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

outer:

while(true){

int column=0;

while(true){

System.out.println("\n\nPlayer 1 play:");

column=Integer.parseInt(br.readLine());

if(c4.isPlayable(column)){

if(c4.playMove(column, 1)){

c4.printBoard();

System.out.println("\n\nPlayer 1 wins!!!");

break outer;

}

break;

}

else

System.out.println("Column "+column+" is already full!!");

}

c4.printBoard();

while(true){

System.out.println("\n\nPlayer 2 play:");

column=Integer.parseInt(br.readLine());

if(c4.isPlayable(column)){

if(c4.playMove(column, 2)){

c4.printBoard();

System.out.println("\n\nPlayer 2 wins!!!");

break outer;

}

break;

}

else

System.out.println("Column "+column+" is already full!!");

}

c4.printBoard();

  

if(c4.isFull()){

System.out.print("Game drawn. Both of you suck at this!!! ");

break;

}

}

}

  

public void printBoard(){

for(int i=0;i<board.length;i++){

for(int j=0;j<board[0].length;j++){

if(board[i][j] == 0)

System.out.print("_ ");

else

System.out.print(board[i][j]+" ");

}

System.out.println();

}

  

for(int i=0;i<boardWidth;i++)

System.out.print("* ");

System.out.println();

  

for(int i=0;i<boardWidth;i++)

System.out.print(i+" ");

System.out.println();

}

  

public boolean playMove(int column, int playerNum){

int i=0;

for(i=0;i<boardHeight;i++){

if(board[i][column] == 1 || board[i][column] == 2){

board[i-1][column]=playerNum;

break;

}

}

if(i == boardHeight)

board[i-1][column]=playerNum;

  

totalMovesPlayed++;

return isConnected(i-1,column);

}

  

public boolean isPlayable(int column){

return board[0][column] == 0;

}

  

public boolean isFull(){

return totalMovesPlayed == boardHeight*boardWidth;

}

  

public boolean isConnected(int x, int y){

int num=board[x][y];

int count=0;

int i=y;

  

while(i<boardWidth && board[x][i] == num){

count++;

i++;

}

i=y-1;

while(i>=0 && board[x][i] == num){

count++;

i--;

}

if(count == 4)

return true;

  

count=0;

int j=x;

while(j<boardHeight && board[j][y] == num){

count++;

j++;

}

if(count == 4)

return true;

  

count=0;

i=x;

j=y;

while(i<boardWidth && j<boardHeight && board[i][j] == num){

count++;

i++;

j++;

}

i=x-1;

j=y-1;

while(i>=0 && j>=0 && board[i][j] == num){

count++;

i--;

j--;

}

if(count == 4)

return true;

  

count=0;

i=x;

j=y;

while(i<boardWidth && j>=0 && board[i][j] == num){

count++;

i++;

j--;

}

i=x-1;

j=y+1;

while(i>=0 && j<boardHeight && board[i][j] == num){

count++;

i--;

j++;

}

if(count == 4)

return true;

  

return false;

}

}