为基本问题提前道歉。我已经写了一些代码，增强而不是编程一个连接4游戏，而一个球员是对两个球员。我的问题是，我似乎无法打成平局，除非r（即玩家）获胜，否则它将继续运行。另外，我注意到的另一件事是，代码中的以下内容似乎总是正确的：

if (player=='R')

请你建议，我怎样才能克服这一点，使赢家可以是三个球员（r，b或y）中的任何一个。以下是完整的代码：

import java.util.Random;
import java.util.Scanner;
public class Main {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);
        char[][] board = new char[6][7];

        for (int row = 0; row < board.length; row++) {
            for (int col = 0; col < board[0].length; col++) {
                board[row][col] = ' ';
            }
        }

        int go = 1;
        char player = 'R';
        char cpu1 = 'B';
        char cpu2 = 'Y';

        boolean winner = false;

        while (winner == false && go <= 42) {

            boolean validMove;
            int play;
            int cpu1play;
            int cpu2play;

            do {

                display(board);

                System.out.println("Player " + player + " choose a column to put your token into");
                play = input.nextInt();

                Random rand = new Random();
                cpu1play = rand.nextInt(6);
                cpu2play = rand.nextInt(6);

                validMove = validate(play, board);
                validMove = validate(cpu1play, board);
                validMove = validate(cpu2play, board);

            } while (validMove == false);

            ///Player
            for (int row = board.length - 1; row >= 0; row--) {
                if (board[row][play] == ' ') {
                    board[row][play] = player;
                    break;
                }

            }
            // CPU1
            for (int row = board.length - 1; row >= 0; row--) {
                if (board[row][cpu1play] == ' ') {
                    board[row][cpu1play] = cpu1;
                    break;
                }

            }
            // CPU2
            for (int row = board.length - 1; row >= 0; row--) {
                if (board[row][cpu2play] == ' ') {
                    board[row][cpu2play] = cpu2;
                    break;
                }

            }

            winner = isWinner(player, board);

            go++;
        }

        display(board);

        if (winner){
            if (player=='R'){
                System.out.println("You won");
            }else if (player == 'B'){
                System.out.println("Cpu1 won");
            }else if (player == 'Y'){
                System.out.println("Cpu2 won");
            }
        }else{
            System.out.println("Tie game");
        }

    }

    public static boolean validate(int column, char[][] board){
        //valid column?
        if (column < 0 || column > board[0].length){
            return false;
        }

        //full column?
        if (board[0][column] != ' '){
            return false;
        }

        return true;
    }

    public static void display ( char[][] board){

        System.out.println("---------------");
        for (int row = 0; row < board.length; row++) {
            System.out.print("|");
            for (int col = 0; col < board[0].length; col++) {
                System.out.print(board[row][col]);
                System.out.print("|");
            }
            System.out.println();
            System.out.println("---------------");
        }
        System.out.println(" 0 1 2 3 4 5 6");
        System.out.println();
    }

    public static boolean isWinner(char player, char[][] board){
        //check for 4 across
        for(int row = 0; row<board.length; row++){
            for (int col = 0;col < board[0].length - 3;col++){
                if (board[row][col] == player   &&
                        board[row][col+1] == player &&
                        board[row][col+2] == player &&
                        board[row][col+3] == player){
                    return true;
                }
            }
        }
        //check for 4 up and down
        for(int row = 0; row < board.length - 3; row++){
            for(int col = 0; col < board[0].length; col++){
                if (board[row][col] == player   &&
                        board[row+1][col] == player &&
                        board[row+2][col] == player &&
                        board[row+3][col] == player){
                    return true;
                }
            }
        }
        //check upward diagonal
        for(int row = 3; row < board.length; row++){
            for(int col = 0; col < board[0].length - 3; col++){
                if (board[row][col] == player   &&
                        board[row-1][col+1] == player &&
                        board[row-2][col+2] == player &&
                        board[row-3][col+3] == player){
                    return true;
                }
            }
        }
        //check downward diagonal
        for(int row = 0; row < board.length - 3; row++){
            for(int col = 0; col < board[0].length - 3; col++){
                if (board[row][col] == player   &&
                        board[row+1][col+1] == player &&
                        board[row+2][col+2] == player &&
                        board[row+3][col+3] == player){
                    return true;
                }
            }
        }
        return false;
    }

}