字符串数组中的随机位置?爪哇 [英] Random position in string array? Java

问题描述

致力于构建井字游戏.我正在尝试使用尽可能简单的方法.我目前正在努力让 cpu 随机选择阵列中的一个点来放置O".我该怎么做?这是我目前所拥有的.

Working on building a tic tac toe game. I'm trying to use as simple of methods as possible. I'm currently working on getting the cpu to randomly choose a spot in the array to place the "O" at. How do I go about doing this? This is what I have so far.

import java.util.Scanner;
import java.util.Random;
public class Player

{
    String player = "X";
    String cpu = "O";
    //private int[][] theBoard= new int [3][3] ;

    private String[][] theBoard=  {{" "," "," "}, {" "," "," "}, {" ", " "," "}};;
    Random cpuInput = new Random(); 

    private Board board1;
    public static Scanner scan = new Scanner(System.in);

public Player(Board board, String inBoard )
    {
        theBoard = theBoard;

    }

    public void computerMove()
    {
        String spacing = " ";
        for (int i = 0; i < theBoard.length; i++)
        {
            for (int j = 0; j < theBoard[i].length; j++)
            {

                //int random = cpuInput.nextInt(theBoard[i][j]);
                theBoard[2][2] = (cpu); //STUCK HERE!                
            }
        }
}

推荐答案

您需要找出黑板上的可用位置，以便计算机进行移动.然后在可用的地点中您可以随机选择一个进行移动.

You need to find out the available spots on the board for computer to make a move. Then among the available spots you can randomly choose one to make a move.

在下面的例子中，我使用一个列表来存储棋盘上的可用点，并使用 Collections.shuffle() 来随机化列表以达到随机移动的目的.

In the below example, I use a list to store the available spots on the board and use Collections.shuffle() to randomize the list to achieve the purpose of making a random move.

class Spot {
    int row;
    int col;

    public Spot(int row, int col) {
        this.row = row;
        this.col = col;
    }
}

public void computerMove() {
    String spacing = " ";

    // firstly finding out the available moves for the computer
    List<Spot> availableSpots = new ArrayList<>();
    for (int i = 0; i < theBoard.length; ++i) {
        for (int j = 0; j < theBoard[i].length; ++j) {
            if (theBoard[i][j].equals(spacing)) {
                availableSpots.add(new Spot(i, j));
            }
        }
    }

    // if no available moves, do nothing, game has ended
    if (availableSpots.isEmpty()) {
        System.out.println("No more spots available on the board.");
        return;
    } else {
        // shuffle the list so that it becomes randomly orderedd
        Collections.shuffle(availableSpots);

        // get the first one of the random list
        Spot spot = availableSpots.get(0);
        theBoard[spot.row][spot.col] = (cpu);
    }
}

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