how to draw a line in html code example

Example 1: how to draw a line in java

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

class Scratch extends JComponent{
    public static void main(String[] args) {
        JFrame window = new JFrame();   // creates a JFrame
        window.setTitle("Example");     //sets the title
        window.setSize(600, 600);   //sets the size
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  // sets the default close operation
        window.setVisible(true);    //sets the JFrame visible
        Scratch drawing = new Scratch();    //indirectly calls the paint method
        window.add(drawing);    //adds the paint method onto the JFrame
    }

    public void paint(Graphics g){
        Graphics2D g2 = (Graphics2D) g; //casting
        g2.drawLine(100, 200, 300, 400);    //Draws a line from (100, -200) -> (300, -400) on the x and y plane
        g2.draw(new Rectangle(10, 10, 10, 10));     //draw a rectangle
        g2.setColor(Color.GREEN);   //Changes colour to Green
        g2.fill(new Rectangle(100, 100, 100, 100)); //fills a rectangle
    }
}

Example 2: horizontal line html

<!-- code -->

<hr>

<!-- code -->

Example 3: how to draw a horizontal line in javascript

var elem = document.createElement("hr");
elem.setAttribute("width", "100px");
document.body.appendChild(elem);

Example 4: hr tag html

<hr> <!-- A horizontal line -->