A random java Maze generator

Line.java

public class Line {

    public int posx;
    public int posy;
    public int dim1;
    public int dim2;

    public Line (int _posx, int _posy, int _dim1, int _dim2) {
        this.posx = _posx;
        this.posy = _posy;
        this.dim1 = _dim1;
        this.dim2 = _dim2;
    }
}

LineFrame.java

import javax.swing.*;
import java.awt.*;
import java.util.ArrayList;

public class LineFrame extends JPanel {

    private double range = 0.5;
    private int spacing = 12;
    private int posX = 0;
    private int posY = 0;
    private static int width = Toolkit.getDefaultToolkit().getScreenSize().width;
    private static int height = Toolkit.getDefaultToolkit().getScreenSize().height;
    private ArrayList<Line> lines;

    public LineFrame() {
        lines = new ArrayList<>();
        //setSize(width,height);
    }

    void drawLines(Graphics g) {
        Graphics2D g2d = (Graphics2D) g;

        if(Math.random() < range) {
            lines.add(new Line(posX, posY, posX + spacing, posY + spacing));
        }else {
            lines.add(new Line(posX, posY + spacing, posX + spacing, posY));
        }

        for(Line l : lines) {
            Stroke stroke = new BasicStroke(2f);
            g2d.setStroke(stroke);
            g2d.setColor(Color.BLACK);
            g2d.drawLine(l.posx, l.posy, l.dim1, l.dim2);
        }

        /**
         * Draw lines by column
         *
        posY = posY+spacing;
        if(posY > height) {
            posY = 0;
            posX = posX+spacing;
        }
        if(posX < width) {
            this.repaint();
        }
        **/

        /**
         * Draw lines by row - default
         */
        posX = posX+spacing;
        if(posX > width) {
            posX = 0;
            posY = posY+spacing;
        }

        if(posY < height) {
            this.repaint();
            System.out.println("LINES ON SCREEN: "+lines.size());
        }else{
            System.out.println("TOTAL: " + lines.size());
        }
    }

    public void paint(Graphics g) {
        super.paint(g);
        drawLines(g);
    }
}

Main.java

import javax.swing.*;
import java.awt.*;

public class Main {

    public static void main(String... args) {
        EventQueue.invokeLater(() -> {
            JFrame frame = new JFrame("MAZE GENERATOR");
            LineFrame lFrame = new LineFrame();
            lFrame.setPreferredSize(Toolkit.getDefaultToolkit().getScreenSize());
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.add(lFrame);
            frame.pack();
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
        });
    }

}