Method equals

04Lab-8Puzzle/Board.java:86–93

(Object y)

    // does this board equal y?
    public boolean equals(Object y) {
        if (y == this) return true;
        if (y == null) return false;
        if (y.getClass() != this.getClass()) return false;
        Board that = (Board) y;
        if (this.n != that.n) return false;
        return Arrays.deepEquals(this.tiles, that.tiles);
    }

    private boolean isSwapable(int row, int col) {
        return row >= 0 && row < n && col >= 0 && col < n;