如何在Java中初始化对象数组

Question

我想初始化一个BlackJack游戏的Player对象数组。我已经阅读了很多有关初始化原始对象（如整数数组或字符串数组）的各种方法的信息，但是我无法将其理解为我在此处尝试做的事情（见下文）。我想返回一个初始化的Player对象数组。要创建的播放器对象的数量是一个整数，我向其提示用户。我以为构造函数可以接受一个整数值，并在初始化Player对象的一些成员变量时相应地命名播放器。我想我很亲密，但仍然很困惑。

static class Player

{

    private String Name;

    private int handValue;

    private boolean BlackJack;

    private TheCard[] Hand;

    public Player(int i)

    {

        if (i == 0)

        {

            this.Name = "Dealer"; 

        }

        else

        {

            this.Name = "Player_" + String.valueOf(i);

        }

        this.handValue = 0;

        this.BlackJack = false;

        this.Hand = new TheCard[2];

    } 

}

private static Player[] InitializePlayers(int PlayerCount)

{ //The line below never completes after applying the suggested change

    Player[PlayerCount] thePlayers;

    for(int i = 0; i < PlayerCount + 1; i++)

    {

        thePlayers[i] = new Player(i);

    }

    return thePlayers;

}

编辑-更新： 这是我了解您的建议后所做的更改：

Thread [main] (Suspended)   

    ClassNotFoundException(Throwable).<init>(String, Throwable) line: 217   

    ClassNotFoundException(Exception).<init>(String, Throwable) line: not available 

    ClassNotFoundException.<init>(String) line: not available   

    URLClassLoader$1.run() line: not available  

    AccessController.doPrivileged(PrivilegedExceptionAction<T>, AccessControlContext) line: not available [native method]   

    Launcher$ExtClassLoader(URLClassLoader).findClass(String) line: not available   

    Launcher$ExtClassLoader.findClass(String) line: not available   

    Launcher$ExtClassLoader(ClassLoader).loadClass(String, boolean) line: not available 

    Launcher$AppClassLoader(ClassLoader).loadClass(String, boolean) line: not available 

    Launcher$AppClassLoader.loadClass(String, boolean) line: not available  

    Launcher$AppClassLoader(ClassLoader).loadClass(String) line: not available  

    BlackJackCardGame.InitializePlayers(int) line: 30   

    BlackJackCardGame.main(String[]) line: 249  

Answer 1

差不多了 只需：Player[] thePlayers = new Player[playerCount + 1];并让循环成为：for(int i = 0; i < thePlayers.length; i++)请注意，Java约定规定方法和变量的名称应以小写字母开头。更新：将您的方法放在类主体中。

Answer 2

代替Player[PlayerCount] thePlayers;你要Player[] thePlayers = new Player[PlayerCount];和for(int i = 0; i < PlayerCount ; i++){&nbsp; &nbsp; thePlayers[i] = new Player(i);}return thePlayers;应该返回用Player实例初始化的数组。

Answer 3

如果不确定数组的大小或它是否可以更改，则可以使用静态数组。ArrayList<Player> thePlayersList = new ArrayList<Player>();&nbsp;thePlayersList.add(new Player(1));thePlayersList.add(new Player(2));..//Some code here that changes the number of players e.gPlayers[] thePlayers = thePlayersList.toArray();