I would like to code a maze on Java Netbeans. I am trying to display a 2d array as a maze on a canvas but I have no idea where to start. Do I code the maze in a java class then call it from the jframe? I have found this method online but am not sure how to incorporate it to fill a canvas or anything else that can display it:

public void grids(Graphics g)
    {
        for (int row = 0; row < 20; row++) {
            for (int col = 0; col < 20; col++) {
                fillColor = Color.BLUE;
                g.setColor(fillColor);
                g.fillRect(col * 30, row * 30, 30, 30);
                g.setColor(Color.BLACK);
                g.drawRect(col * 30, row * 30, 30, 30);
            }
        }
    }   //End of grids method

I would really appreciate any help. I am new to working with GUIs…

I have tried to instantiate an object of the class and call this method but was not sure what a graphics object was. It did not work.