麻烦与JButtons和2darrys

Question

我正在尝试制作类似于扫雷车的游戏。我遇到了JButtons的问题。 因此，我试图将JButtons添加到2d数组，将它们排列在等于行和列的网格中，然后将它们添加到面板并将面板添加到jframe，尝试在另一个类中调用它，除了它什么都不做。

public class Field{


private int row_value;
private int column_value;
private JButton board[][];
private JPanel panel;
private GridLayout grid_layout;

//creates the board with the buttons and adds cell to each of the buttons

public Field(){

    row_values();
    Column_values();
    int x = row_value;
    int y = column_value;
    grid_layout = new GridLayout(x, y);
    board = new JButton[x][y];
        for(int row = 0; row < board[x].length ;row++){  //stops here
            for(int col = 0; col< board[y].length;col++){
                board[row][col] = new JButton();
                board[row][col].addActionListener(new Cell());//adds action listener to cell?
                 panel.add(board[row][col]);

            }

        }

    panel.setVisible(true);
    mainframe.add(panel);
}