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
}
}