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@PCJohn
Last active November 30, 2020 14:37
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A Java text based game for Connect Four
/*Java source for a simple, text based game of Connect Four. Change the package name as required.
Players must enter a number between 0 and 7 (both inclusive) to specify the column in which he/she wants to drop his/her chip.
Author: Prithvijit Chakrabarty (prithvichakra@gmail.com)*/
package projectjava;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class ConnectFour {
final int boardWidth=8;
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));
System.out.println("WELCOME TO CONNECT FOUR!!!");
outer:
while(true){
int column=0;
//PLAYER 1.
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();
//PLAYER 2.
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;
//HORIZONTAL.
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;
//VERTICAL.
count=0;
int j=x;
while(j<boardHeight && board[j][y] == num){
count++;
j++;
}
if(count == 4)
return true;
//SECONDARY DIAGONAL.
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;
//LEADING DIAGONAL.
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;
}
}
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