創建三種方法，更改值？ java

Question

我有一個java程序，我有一點難度，並會真正感謝幫助。

• addMine方法（應該改變the_minefield的值（在元件thisCol，thisRow）從EMPTY_SQUARE到MINE_SQUARE，並返回值真。）

-addMine方法（如果輸入參數位於外雷區的尺寸，那麼該方法不應該改變該類的狀態，並返回錯誤。）

-addMine方法（如果在輸入參數指示的方塊中已經有一個地雷，那麼再次方法不應該改變類的狀態，並返回false。）

-getValue方法（應返回請求的行和列處的雷區值。 （目前，雷區中的值是MINE_SQUARE或EMPTY_SQUARE）。如果行和列的謊言雷區之外，此方法應返回0）

-addMinesToCorners（應該做的事情，它說，加4枚水雷）

class MineFinderModel 
{ 
public static int MINE_SQUARE = 10; 
public static int EMPTY_SQUARE = 0; 

int num_of_cols; 
int num_of_rows; 
int[][] the_minefield; 

public MineFinderModel(int n_cols, int n_rows) 
{ 
    num_of_rows = n_rows; 
    num_of_cols = n_cols; 
    the_minefield = new int[num_of_cols][num_of_rows]; 
} 

public boolean addMine(int thisCol, int thisRow) 
{ 

    return false; // but you sometimes need to return true; 
} 
public int getValue(int thisCol, int thisRow) 
{ 

    return 0; // but you need to return other numbers at times; 
} 
public void addMinesToCorners() 
{ 
} 

}

Answer 1

public void addMinesToCorners() 
{ 
/*Adding mines to four corners*/ 
the_minefield[0]0]    = "Corner Mine1" 
the_minefield[0][num_of_cols -1] = "Corner Mine2" 
the_minefield[num_of_rows-1][0] = "Corner Mine2" 
the_minefield[num_of_rows -1][num_of_cols -1] = "Corner Mine2" 
} 

Answer 2

public boolean addMine(int thisCol, int thisRow) 
{ 
    if(thisCol >= n_cols || thisRow >= n_rows) 
     return false; 
    if(the_minefield[thisCol][thisRow] == MINE_SQUARE) 
     return false; 
    the_minefield[thisCol][thisRow] = MINE_SQUARE; 
    return true; 
} 
public int getValue(int thisCol, int thisRow) 
{ 
    if(thisCol >= n_cols || thisRow >= n_rows) 
     return 0; 
    return the_minefield[thisCol][thisRow]; 
} 
public void addMinesToCorners() 
{ 
    the_minefield[0][0] = MINE_SQUARE; 
    the_minefield[0][n_rows - 1] = MINE_SQUARE; 
    the_minefield[n_cols - 1][0] = MINE_SQUARE; 
    the_minefield[n_cols - 1][n_rows - 1] = MINE_SQUARE; 
}