我正在制作一个tic tac toe游戏，其中一个要求是让游戏随机决定谁先行。我假设我应该使用Math.random（）但我不知道如何实现它。如果有人可以，请帮助调整我的代码，谢谢：）
import java.util.Scanner;
public class TicTacToe
{
public static void main(String[] args)
{
Scanner console = new Scanner (System.in);
Game ticTacToe = new Game();
String no = "no";
System.out.println("~~~Tic Tac Toe~~~");
System.out.println("Would you like to play?");
String playerAnswer = console.nextLine();
while(!playerAnswer.equals(no))
{
ticTacToe.play();
System.out.println("Thanks for playing");
System.out.println("Would you like to play again? Press any key for yes, type no if you don't ");
playerAnswer=console.nextLine();
}
}
}
class Game
{
private final int empty = 0;
private final int player = 1;
private final int com = 2;
private final int size = 3;
private int[][] board;
public void printScreen()
{
int col;
int row;
System.out.println();
System.out.print(" ");
for (col = 0; col < size; col ++)
{
System.out.print(" " + (col+1));
}
System.out.println();
System.out.print(" ");
for (col = 0; col < size; col ++)
{
System.out.print("--");
}
System.out.println("-");
for (row = 0; row < size; row ++)
{
System.out.print((row+1) + "|");
for (col = 0; col < size; col ++)
{
if (board[row][col] == empty)
{
System.out.print(" ");
}
else if (board[row][col] == player)
{
System.out.print("X");
}
else if (board[row][col] == com)
{
System.out.print("O");
}
System.out.print("|");
}
System.out.println();
System.out.print(" ");
for (col = 0; col < size; col ++)
{
System.out.print("--");
}
System.out.println("-");
}
}
public void clear()
{
int col;
int row;
board = new int[size][size];
for (row = 0; row < size; row ++)
{
for (col = 0; col < size; col ++)
{
board[row][col] = empty;
}
}
}
public void computerMove()
{
int col;
int row;
int count;
int select;
count = 0;
for (row = 0; row < size; row ++)
for (col = 0; col < size; col ++)
if (board[row][col] == empty)
count ++;
select = (int) (Math.random() * count);
count = 0;
for (row = 0; row < size; row ++)
{
for (col = 0; col < size; col ++)
{
if (board[row][col] == empty)
{
if (count == select)
{
board[row][col] = com;
System.out.println("The computer selects row" + (row+1) + " column " + (col+1) + ".");
}
count ++;
}
}
}
}
public void playerMove()
{
Scanner console = new Scanner (System.in);
boolean a;
int col;
int row;
a = true;
while (a)
{
System.out.println("What is your move? Select a row number from 1 to " + size + " and a column number from 1 to " + size + ".");
row = console.nextInt();
col = console.nextInt();
if ((row < 1) || (row > size) || (col < 1) || (col > size))
{
System.out.println("Invalid choice, row " + row + " or column " + col + " must be from 1 to " + size + ".");
}
else
{
row --;
col --;
if (board[row][col] != empty)
{
System.out.println("That spot is already filled");
printScreen();
}
else
{
board[row][col] =player;
a = false;
}
}
}
}
public boolean checkWinner()
{
int col;
int row;
int count;
int win;
win = empty;
for (row = 0; row < size; row ++)
{
count = 0;
if (board[row][0] != empty)
for (col = 0; col < size; col ++)
if (board[row][0] == board[row][col])
count ++;
if (count == size)
win = board[row][0];
}
for (col = 0; col < size; col ++)
{
count = 0;
if (board[0][col] != empty)
for (row = 0; row < size; row ++)
if (board[0][col] == board[row][col])
count ++;
if (count == size)
win = board[0][col];
}
count = 0;
if (board[0][0] != empty)
for (row = 0; row < size; row ++)
if (board[0][0] == board[row][row])
count ++;
if (count == size)
win = board[0][0];
count = 0;
if (board[0][size-1] != empty)
for (row = 0; row < size; row ++)
if (board[0][size-1] == board[row][size-row-1])
count ++;
if (count == size)
win = board[0][size-1];
if (win != empty)
{
if (win == player)
System.out.println("Congratz you won");
else if(win == 3)
System.out.println("you lost");
return true;
}
count = 0;
for (row = 0; row < size; row ++)
for (col = 0; col < size; col ++)
if (board[row][col] == empty)
count ++;
if (count == 0)
{
System.out.println("Its a tie!");
return true;
}
return false;
}
public void play()
{
boolean e;
clear();
e=false;
while (!e)
{
printScreen();
playerMove();
printScreen();
e = checkWinner();
if (!e)
{
computerMove();
e = checkWinner();
if (e)
printScreen();
}
}
}
}
答案 0 :(得分：1)
可能有很多方法可以做到这一点，包括使用Random生成器类，但由于tic-tac只有两个玩家，这可以简单地做为获取布尔值
boolean player1Starts = (System.currentTimeMillis() % 2) == 0;
答案 1 :(得分：1)
要实现这一点，您必须更改播放方法。
public void play()
{
boolean playerTurn = Math.random() <= .5
//this function returns a value between 0 an 1 exclusive
clear();
printScreen();
while (!checkWinner())
{
if (playerTurn) {
playerMove;
} else {
computerMove();
}
playerTurn = !playerTurn;
printScreen();
}
}