Getting ArrayStoreException error when trying to add a subclass object to super class array

Question

I am making a checkers game and have the following classes. Abstract class piece:

public abstract class Piece {

protected Position position;
private CheckersColor color;

public Piece(CheckersColor color, Position position) {
    this.position = position;
    this.color = color;

}

with some more methods.

The sub class Checker:

public class Checker extends Piece {

public Checker(CheckersColor color, Position position) {
    super(color, position);
}

with also some more methods, and another sub class king:

public class King extends Piece {

public King(CheckersColor color, Position position) {
    super(color, position);
}

public King(Piece checker) {
    super(checker.getColor(), checker.position);
}

The checkers are stored in an array of type Piece

private Piece[] whiteCheckers;

and inserted by :

whiteCheckers[counter] = new Checker(Constants.COLOR_WHITE, tempPosition);

So far everything works, but when I try to change one of the checkers into a king I get an error:

Exception in thread "main" java.lang.ArrayStoreException: King

The code that causes the error:

whiteCheckers[i] = new King(piece);

I have tried a few different ways to store it, with casting, removing the checker and adding the king in the same spot and more with no luck.

That's really weird to me because the checkers were stored with no problem and king causes the error while they are both sub classes of Piece.

Thanks a lot!

EDIT:

public class Board {
private int size;
private Piece[] blackCheckers;
private Piece[] whiteCheckers;
private Piece[][] board;

public Board(int size) {
        ....(Some other code)

        for (int k = 0; k < whiteCheckers.length; k++) {
            board[whiteCheckers[k].position.getRow()][whiteCheckers[k].position.getColumn()] = whiteCheckers[k];
            board[blackCheckers[k].position.getRow()][blackCheckers[k].position.getColumn()] = blackCheckers[k];

        }

    } else {
        throw new RuntimeException("The size is either smaller than 4 or is not even");
    }
}
    ....(Some more methods)

public void verifyCrown(Piece piece) {
    if ((piece.getColor().equals(Constants.COLOR_WHITE) && piece.position.getRow() == 0)
            || piece.getColor().equals(Constants.COLOR_BLACK) && piece.position.getRow() == size - 1) {

        if (piece.getColor().equals(Constants.COLOR_WHITE)) {
            for (int i = 0; i < whiteCheckers.length; i++) {
                if (whiteCheckers[i].equals(piece)) {
                    whiteCheckers[i] = new King(piece);

                }
            }
        }

        if (piece.getColor().equals(Constants.COLOR_BLACK)) {
            for (int i = 0; i < blackCheckers.length; i++) {
                if (blackCheckers[i].equals(piece)) {
                    blackCheckers[i] = new King(piece);

                }
            }
        }
    ....
    }
}

}

by the way, show a code, where you assign a value to whiteCheckers array — Orest Savchak
– Orest Savchak, Commented Jan 5, 2017 at 21:20
Thanks for answering! It is an assignment so we have to use arrays, I have added some code I hope it is easier to understand now. — Gilmor
– Gilmor, Commented Jan 5, 2017 at 21:36

crazyExplorer · Accepted Answer · 2017-01-08 11:56:36Z

1

Can you please show us how the array is initialized? The cause could be that you initialize the array as follows:

Piece[] whiteCheckers = new Checker[n];

instead of

Piece[] whiteCheckers = new Piece[n];

which would not allow you to add objects of type King to it.

But again without seeing how the array was initialized, this may not be the case.

answered Jan 8, 2017 at 11:56

crazyExplorer

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1 Comment

Gilmor Over a year ago

Thanks a lot!!! That was the mistake, I was so sure that I made it piece so I didn't even check.

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