Thread: GUI minesweeper help

I have to make a GUI version of minesweeper for my class.

I think I have everything done, but when I execute the program the JFrame pops up but with no content.
Can anyone see what is wrong with my code? Because I am stumped.

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.InputEvent;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JToggleButton;
 
 
public class mineSweeperGame extends JFrame{
 
	private static final long serialVersionUID = 1L;
 
	private int rows, columns = 10;
 
	private int cR, cC = 0;
 
	JToggleButton buttons[][] = new JToggleButton[rows][columns];
 
    int cells[][] = new int[rows][columns];
 
	boolean bombs[][], shown[][] = new boolean[rows][columns];
 
	private Container container = null;
 
	public mineSweeperGame(){
 
		super("Minesweeper");
		startGame();
 
	}
 
	private void startGame(){
 
	    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		this.setSize(500, 500);
 
		   container = this.getContentPane();
 
		   for(int r = 0; r < rows; r++){
	    		for(int c = 0; c < columns; c++){
 
	    			cR= r;
	    			cC = c;
 
	    			Random b = new Random();
	    			bombs[r][c] = b.nextBoolean() && b.nextBoolean() && b.nextBoolean();
 
	    			buttons[r][c] = new JToggleButton("");
 
	    			buttons[r][c].addMouseListener(new java.awt.event.MouseAdapter(){
	    				public void mouseReleased(java.awt.event.MouseEvent e){
	    					if(e.getModifiers() == InputEvent.BUTTON3_MASK){
	    						markCell(e);
	    					}
	    					else if(e.getModifiers() == InputEvent.BUTTON1_MASK){
	    						showCell(e);
	    					}
	    				}
	    			});
 
	    			container.add(buttons[r][c], BorderLayout.CENTER);
 
	    			cells[r][c] = bombCount(r,c);
	    			shown[r][c] = false;
 
 
	    		}
	        }
 
 
		this.setVisible(true);
	    this.validate();
	    this.repaint();
 
   }
 
   public void markCell(java.awt.event.MouseEvent e){
 
 
	      JToggleButton button = (JToggleButton)e.getSource();
 
	      if(button.isEnabled()){
	    	  if(button.getText() != "!"){
	    		  if(button.getText() != "!"){
	    			  button.setText("!"); 
	    		  }
 
	    	  else{
	    		   button.setText("");
	    	   }
	       }
	    }
 
	}
 
	public void showCell(java.awt.event.MouseEvent e){
 
		JToggleButton buttons = (JToggleButton)e.getSource();
 
    	if(buttons.isEnabled()){
    		buttons.setEnabled(false);
 
    		if(isBomb(buttons)){
 
    			endGame();
    			buttons.setEnabled(false);
    			disableBoard();
 
    		}
 
    		else{
 
    			if(cells[cR][cC] > 0){
    				buttons.setText(Integer.toString(cells[cR][cC]));
    			}
 
    			else if(cells[cR][cC] == 0){
    				clearCells(cR, cC);
    			}
    		}
    	}
 
	}
 
	private int bombCount(int x, int y){
 
		int bombCount = 0;
		for(int r = -1; r <= 1; r++){
			for(int c = -1; c <= -1; c++){
 
				int i = x + r;
				int j = y + c;
 
				if(0 <= i && i < cells.length && 0 <= j && j < cells[i].length){
					bombCount++;
				}
			}
		}
 
		return bombCount;
	}
 
	private void clearCells(int cR, int cC){
		for(int r = 0; r < rows; r++){
			for(int c = 0; c < columns; c++){
				if(!shown[r][c] == false && bombs[r][c] == false){
 
					shown[r][c] = true;
 
					JToggleButton button = findButton(r, c);
 
					if(cells[r][c] > 0){
						button.setText(Integer.toString(cells[r][c]));
					}
 
					else{
						button.setText("");
					}
 
					button.setSelected(true);
					button.setEnabled(false);
 
					if(cells[r][c] == 0){
						for(int i = -1; i <= 1; i++){
							for(int j = -1; j <= 1; j++){
 
								clearCells(i+r, j+c);
 
							}
						}
					}
				}
			}
		}
	}
 
	private JToggleButton findButton(int r, int c){
		return buttons[r][c];
	}
 
	private boolean isBomb(JToggleButton button){
 
	   for(int r = 0; r < rows; r++){
		   for(int c = 0; c < columns; c++){
			   if(button == buttons[r][c]){
				   cR = r;
				   cC = c;
				   return bombs[r][c];
			   }
		   }
	   }
 
	   return false;
 
	}
 
	private void endGame(){
 
		for(int r = 0; r < rows; r++){
			for(int c = 0; c < columns; c++){
				if(bombs[r][c] == true){
					JToggleButton button = findButton(r, c);
 
					button.setText("*");
					button.setSelected(true);
					button.setEnabled(false);
				}
			}
		}
	}
 
	private void disableBoard(){
 
		for(int r = 0; r < rows; r++ ){
			for(int c = 0; c < columns; c++){
				JToggleButton button = findButton(r,c);
 
				button.setEnabled(false);
			}
		}
	}
 
	public static void main(String[] args){
 
		mineSweeperGame go = new mineSweeperGame();
 
	}
 
 
 
 
}

Try adding some print statements in your for loop. You will not be getting into your loop at all.

private int rows, columns = 10; <--This does not work like you think it does.

private int rows=10, columns=10; <--This is what you want it to look like.

You will probably also want to use setPreferredSize on the buttons. Probably around 40x40 so that you have a 10x10 board.

Also it is normal convention to name your classes with Capital letters. This is not really a big deal it is just not conventional to use a lowercase starting letter for a class name.