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 } }
