MineSweeperData.java

public class MineSweeperData {

    public static final String blockImageURL = "resources/block.png";
    public static final String flagImageURL = "resources/flag.png";
    public static final String mineImageURL = "resources/mine.png";
    public static String numberImageURL(int num){
        if(num < 0 || num > 8)
            throw new IllegalArgumentException("No such a number image!");
        return "resources/" + num + ".png";
    }

    private int N, M;
    private boolean[][] mines;

    public MineSweeperData(int N, int M, int mineNumber){

        if(N <= 0 || M <= 0)
            throw new IllegalArgumentException("Mine sweeper size is invalid!");

        if(mineNumber < 0 || mineNumber > N*M)
            throw new IllegalArgumentException("Mine number is larger than the size of mine sweeper board!");

        this.N = N;
        this.M = M;

        mines = new boolean[N][M];
        for(int i = 0 ; i < N ; i ++)
            for(int j = 0 ; j < M ; j ++){
                mines[i][j] = false;
            }

        mines[0][0] = true;
    }

    public int N(){ return N; }
    public int M(){ return M; }

    public boolean isMine(int x, int y){
        if(!inArea(x, y))
            throw new IllegalArgumentException("Out of index in isMine function!");
        return mines[x][y];
    }

    public boolean inArea(int x, int y){
        return x >= 0 && x < N && y >= 0 && y < M;
    }

}