Question

我想为一个简单的游戏创建一个程序。游戏有3个类：

Player：包含播放器详细信息，如用户名，姓氏和姓氏
Nimsys：包含游戏所有方法的系统功能，最多可以有100名玩家
NimGame：1场比赛仅由2名球员进行

问题：我创建了3个类，但我不知道如何将这些类链接在一起。如何使用Scanner和StringTokenizer添加播放器名称以分隔用户名，姓氏和姓氏？我的主要方法应该在NimGame班吗？在我的代码中，当我调用NimPlayer.addPlayer()时，它会显示错误消息，即类型addPlayer的方法NimPlayer未定义。请帮助如何使用方法addPlayer ??

到目前为止，我的代码看起来像这样：

public class NimGame 
{
int currentStoneCount, stoneRemovalUpperBound;
private NimPlayer player1, player2;

public static void main (String [] args) 
{
    System.out.println ("Welcome to Nim");
    System.out.println("\n>");

    **NimPlayer.addPlayer();**
}

public class NimPlayer 
{
String userName, givenName, familyName, newFamilyName, newGivenName;
int gamesPlayed, gamesWon, gamesLost;

/*Constructor*/
public NimPlayer (String userName, String givenName, String familyName,
                      String newFamilyName, String newGivenName)
{
    this.userName = userName;
    this.givenName = givenName;
    this.familyName = familyName;
    this.newFamilyName = newFamilyName;
    this.newGivenName = newGivenName;
}
}

import java.util.Scanner;
java.util.StringTokenizer;

public class Nimsys 
{
public static void addPlayer()
{
    Scanner keyboard = new Scanner (System.in);
    String [ ] player = new String [100]; //an array of 100 players

    for (int i = 0; i < 100; i++) 
    {
    boolean isInArray = false;
    String NimPlayer = keyboard.next();
    String delimiters = " add player, "; //add player, comma and blank space
    StringTokenizer nameFactory = new StringTokenizer (NimPlayer, delimiters);
    String userName = nameFactory.nextToken();
    String familyName = nameFactory.nextToken();
    String givenName = nameFactory.nextToken();

    if (i>0)
    {
        for (int j = 0; j < 100; j++)
            {
                if (player [j].equalsIgnoreCase(userName))
                { 
                    isInArray = true;
                    System.out.println("The player already exists.");
                    System.out.println("\n>");
                }
                else
                {
                    player [j] = NimPlayer;
                    System.out.println("\n>");
                }
            }
        }


    }
}
}

Answer 1

我想你想要

NimSys.addPlayer();

严重受损：

player [j] = NimPlayer;

你可能意味着

player [j] = new NimPlayer( ...,...,... );

NimPlayer构造函数所需的所有（太多？）参数。但话说回来，player是一个String数组，因此您应该更改此定义。

为什么你认为你需要100名球员？

Answer 2

支持laune所说的，你不能打电话

NimPlayer.addPlayer();

因为你的addPlayer方法在NimSys类中，而不是NimPlayer。而你的

String [ ] player = new String [100]; //an array of 100 players

需要是NimPlayer类型，因为它包含NimPlayers，而不是字符串。为了能够稍后添加/编辑，我将其更改为List：

List<NimPlayer> player = new ArrayList<NimPlayer>(); //an array of x amount of players

从我可以收集的有关您的代码的内容来看，最好的方法似乎是在NimPlayer类中创建一个没有参数的构造函数

public NimPlayer(){
}

创建一个新的NimPlayer

currentPlayer = new NimPlayer();

并指定如下值：

currentPlayer.userName = nameFactory.nextToken();
currentPlayer.familyName = nameFactory.nextToken();
currentPlayer.givenName = nameFactory.nextToken();

从那里你可以通过比较用户名来比较这个currentPlayer和你阵列中的所有其他NimPlayers：

        for (int j = 0; j < player.size(); j++)
        {
            NimPlayer storedPlayer = player.get(j);
            if (storedPlayer.userName.equalsIgnoreCase(currentPlayer.userName))
            { 
                isInArray = true;
                System.out.println("The player already exists.");
                System.out.println("\n>");
            }
            else
            {
                player.add(currentPlayer);
                System.out.println("\n>");
            }
        }

我可以在java的当前类中调用我在另一个类中创建的方法吗？

2 个答案: