Distance between buttons (Flow Layout)

Question

Hi people,
I Have 100 buttons inside a JPane with Flow Layout.
How do I set the distance between the buttons to 0(width and height)?
Regards.
Thank's.

Answer 1

Yes, I did!
I have a class "Board" that extends JPanel with GridLayout.
This class has a constructor that takes the rows, cols, number of mines and size of squares!
package view;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.util.Random;
import javax.swing.JPanel;
import model.Square;
import control.SquareHandler;
public class Board extends JPanel {
     private Square square[][] = new Square[16][30];
     private int mines, width, height;
     Board(int width, int height, int mines, int size) {
          Dimension dimension = new Dimension(size,size);
          //FlowLayout layout = new FlowLayout();
          GridLayout layout = new GridLayout();
          //layout.setHgap(0);
          //layout.setVgap(0);
          layout.setRows(height);
          layout.setColumns(width);
          this.mines = mines;
          this.width = width;
          this.height = height;
          setLayout(layout);
          for (int j = 0; j < height; j++){
               for (int i = 0; i < width; i++){
                    square[j] = new Square(i,j);
                    square[j][i].setPreferredSize(dimension);
                    square[j][i].addActionListener(new SquareHandler(this, i, j));
                    add(square[j][i]);
          makeMines();
     public void makeMines() {
          Random randomizer = new Random();
          int randomX, randomY;
          for (int i = 0; i < mines; i++){
               while (true) {
                    randomX = randomizer.nextInt();
                    randomX = Math.abs(randomX);
                    randomX = randomX % width;
                    randomY = randomizer.nextInt();
                    randomY = Math.abs(randomY);
                    randomY = randomY % height;
                    if(!square[randomY][randomX].getMine()){
                         square[randomY][randomX].setMine();
                         break;
     public Square getSquare(int x, int y){
          if (x < 0 || x >= width || y < 0 || y >= height ){
               // Error
               return new Square(-1,-1);
          return square[y][x];