Question

我有三节课。玩家类：

public class Player
{
private String playerName;
private int playerWorth;
private int playerSpent;
// A list of player prize objects.
private ArrayList<Prize> playerPrizeList;

public void Player()
{
     playerPrizeList = new ArrayList <Prize>();
     playerName = "";
     playerWorth = 0;
     playerSpent = 0;
}

public void playerDetails(String playerName, int playerWorth, int playerSpent)
{
    setPlayerName(playerName);
    setPlayerWorth(playerWorth);
    setPlayerSpent(playerSpent);
}

public void prize(String prizeName, int prizeWorth, int prizeCost)
{
    populatePrize(prizeName, prizeWorth, prizeCost);
}

private void populatePrize(String prizeName, int prizeWorth, int prizeCost)
{
    playerPrizeList.add(new Prize(prizeName, prizeWorth, prizeCost));
}

另一个类是PlayerList类，我试图将一个新的播放器对象添加到一个有效的arrayList中，但是我在这个Player类中也有一个prizeList数组（Prize Objects）。一旦我将播放器添加到ArrayList，我如何检索该对象并进行更改（我的最后一段代码）。我希望我能正确解释。

public class PlayerList
{
private ArrayList<Player> playerAList; 

public PlayerList() 
{
    playerAList = new ArrayList<Player>();
}

public ArrayList<Player> addPlayer(String playerName, int playerWorth, int playerSpent)
{
    Player newPlayer = new Player();
    newPlayer.setPlayerName(playerName);
    newPlayer.setPlayerWorth(playerWorth);
    newPlayer.setPlayerSpent(playerSpent);
    playerAList.add(newPlayer);
    return playerAList;
}

/**
 * @i is the index of ArrayList for Player Prizes
 */
public void setPlayerPrizeList(int i, String prizeName, int prizeWorth, int prizeCost)
{
    playerAList.get(i) =  currentPlayer;
    currentPlayer.populatePrize(prizeName, prizeWorth, prizeCost);
    playerAList.set(i, currentPlayer);
    return playerAList;
}

Answer 1

一般来说，您的方法看起来不错。

但您的代码中存在一些问题：

您无法为方法调用指定值。

playerAList.get(i) =  currentPlayer;

但这应该有效：

currentPlayer = playerAList.get(i);

除此之外，您不需要这一行：
```
playerAList.set(i, currentPlayer);
```
此方法中您要更改的Player会保留在列表中并自动更新＆＃34;，因为所有更改都在同一个内存块上执行，{{1}已经创建了。Player和playerAList都拥有对此内存块的引用。
还有一件事是错的。您无法currentPlayer来自返回类型为return的方法的任何内容：
```
void
```

总而言之，您的方法return playerAList;应如下所示：

setPlayerPrizeList()

修改ArrayList中的ArrayList

1 个答案: