java - 找不到 getColor() 方法？国际象棋游戏帮助 Java

Question

所以我尝试用 Java 编写一个国际象棋程序，但是我的 getColor() 方法遇到了一些问题。我依赖于 Gridworld 的一些代码。我为每件作品创建了一个类。我希望这件作品像 Gridworld 中的小动物一样工作，因为我有一个方法可以创建一个 ArrayList，其中包含移动时可供选择的可能位置。这就是我遇到问题的地方。我尝试创建 getColor() 方法，但由于某种原因它不起作用。我向老师寻求帮助，但他和我一样困惑。我尝试调试它，但我没有发现它有任何问题。我得到的确切错误是这样的:

“找不到符号 - 方法 getColor()”

这是我的所有代码，我使用 BlueJ 作为记录:

import java.util.ArrayList;
import java.awt.Color;

public interface Piece
{
    public enum PieceType {pawn, rook, knight, bishop, queen, king}
}

接下来是 ChessPiece 抽象类。不过，我还没有研究过 selectMoveLocation 方法:

import java.util.ArrayList;
import java.awt.Color;
import info.gridworld.grid.Location;
import info.gridworld.grid.BoundedGrid;

public abstract class ChessPiece implements Piece
{
    Color colorOfPiece;
    PieceType typeOfPiece;
    public BoundedGrid<Object> board;
    public Location location;
    public ArrayList moveLocations;

    public ChessPiece( Color whiteOrBlack, PieceType selectedType)
    {
        if (whiteOrBlack == Color.BLACK || whiteOrBlack == Color.WHITE)
        {
            if ((selectedType == PieceType.pawn || selectedType == PieceType.rook || selectedType == PieceType.knight || selectedType == PieceType.bishop ||selectedType == PieceType.queen || selectedType == PieceType.king))
            {
                colorOfPiece = whiteOrBlack;
                typeOfPiece = selectedType;
                location = null;
            }
        }
    }

    public Color getColor()
    {
        return colorOfPiece;
    }

    public void makeMove(Location newLocation)
    {
        if (board == null)
            throw new IllegalStateException("This actor is not in a board.");
        if (board.get(location) != this)
            throw new IllegalStateException(
                "The board contains a different actor at location "
                + location + ".");
        if (!board.isValid(newLocation))
            throw new IllegalArgumentException("Location " + newLocation
                + " is not valid.");

        if (newLocation.equals(location))
            return;
        board.remove(location);
        location = newLocation;
        board.put(location, this);
    }

    public Location getLocation()
    {
        return location;
    }

    public BoundedGrid<Object> getBoard()
    {
        return board;
    }

    public Location selectMoveLocation(ArrayList<Location> moveLocations)
    {
        Location selection;
        selection = null;
        //mouse stuff
        return selection;
    }

}

最后，给出编译器错误的代码。这只是我的 King 作品的代码，尽管它给了我尝试实现它的每一个作品的错误:

import java.awt.Color;
import java.util.ArrayList;
import info.gridworld.grid.Location;
import info.gridworld.grid.BoundedGrid;

//must fix problem with getColor()
public class King extends ChessPiece
{
    ArrayList<Location> moveLocations;
   // private Color colorOfPiece;

    public King( Color whiteOrBlack )
    {
        super(whiteOrBlack, PieceType.king);
        //colorOfPiece = whiteOrBlack;
    }

    public void getMoveLocations()
    {
        moveLocations.clear();
        for (int i = 0; i < 360; i += 45)
        {
            if ((getBoard().isValid(getLocation().getAdjacentLocation(i))) && (((getBoard().get(getLocation().getAdjacentLocation(i))) == null) || (((getBoard().get(getLocation().getAdjacentLocation(i)))).getColor() == colorOfPiece)))
            {
                moveLocations.add(getLocation().getAdjacentLocation(i));
            }
        }
    }
}

Answer 1

getBoard().get(..) 根据我在网上找到的文档返回模板类型 E，在您的情况下，E 是类型对象(因为 ChessPiece 中的棋盘数据成员是对象的集合。)对象没有 getColor() 方法。您需要将 (((getBoard().get(getLocation().getAdjacentLocation(i)))) 转换为具有 getColor 方法的类。(或者将您的棋盘更改为国际象棋棋子的集合)