Java中泛型类的泛型类

2019-12-10 08:02:31 阅读：222 来源： 互联网

我有一个这样的类层次结构设置：

public abstract class GameController
public abstract class Game

我想使用通用的GameController类,因此它需要特定的Game子类,因此我将其更改为：

public abstract class GameController<GameType extends Game>
public abstract class Game

但是后来我也想拥有一个通用游戏来接受特定的玩家子类,因此我将其更改为：

public abstract class GameController<GameType extends Game<PlayerType>, PlayerType extends Player>
public abstract class Game<PlayerType extends Player>

有没有一种更好的方法可以解决这个问题,所以我不必两次声明PlayerType(在GameController子类和Game子类中)？

编辑：

GameController是一个网络类,它接收发布和获取请求,并将它们转换为更接近游戏所需的内容,然后一个子类(例如MyGameController)进一步将发布的byte []转换为特定游戏类的方法调用,说MyGame.代码示例：

GameController：

public abstract class GameController<GameType extends Game<PlayerType>, PlayerType extends Player> {
    private Hashtable<String, GameType> games;
    public MultiplayerMain() {
        super();
        games = new Hashtable<String, GameType>();
    }
    protected abstract GameType createGame(InputStream in, String gameId);
    protected abstract PlayerType createPlayer(InputStream in, GameType game, String playerId);
    protected abstract byte[] gameAction(InputStream in, GameType game, PlayerType player);

    //Other stuff that calls createGame, createPlayer, and gameAction
}

游戏：

public abstract class Game<PlayerType extends Player> {
    private Hashtable <String, PlayerType> players = new Hashtable<String, PlayerType>();
    public final String gameId;
    public Game (String id) {
        gameId = id;
    }
    public abstract byte[] getGameState();
    public abstract byte[] getGameState(PlayerType player);
    final PlayerType getPlayer(String userId) {
        return players.get(userId);
    }
    final void addPlayer(PlayerType player) {
        players.put(player.userId,player);
        playerAdded(player);
    }
    final void removePlayer(PlayerType player) {
        players.remove(player);
        playerRemoved(player);
    }
    protected void playerAdded(PlayerType player) {}
    protected void playerRemoved(PlayerType player) {}
}

MyGameController：

public class MyGameController extends GameController<MyGame,MyPlaer> {
    protected MyGame createGame(InputStream in, String gameId) {
        byte[] data = getInitializationData(in);
        return new MyGame(gameId,data);
    }

    protected byte[] gameAction(InputStream in, MyGame game, Player player) {
        byte[] data = getData(in);
        MyGame.methodSpecificToMyGameClassBasedOnInputStream(data);
        return game.getGameState(player);
    }

    protected Player createPlayer(InputStream in, MyGame game, String playerId) {
        byte[] otherData = getOtherData(in,game)
        return new MyPlayer(playerId,otherData);
    }
}

MyGame：

public class MyGame extends Game<MyPlayer> {

    public MyGame(String id) {
        //...
    }

    public byte[] getGameState() {
        //...
    }

    public byte[] getGameState(Player user) {
        //...
    }

    public void methodSpecificToMyGameClassBasedOnInputStream(byte[] data) {
        //...
    }
}

解决方法:

您是否需要泛型？而是可以将Player注入Game并将Game注入GameController吗？

public class Game {
    private final PlayerType playerType;

    public Game(PlayerType playerType) {...}

}

public class GameController {
    private final Game game;

    public GameController(Game game) {...}
}

标签：generics,java
来源： https://codeday.me/bug/20191210/2100352.html

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Java中泛型类的泛型类