import javax.swing.*;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;

class Program extends JFrame {
	
	Program() {
		getContentPane().add(new SajatKomponens());
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setSize(800, 600);
		setVisible(true);
	}
	
	public static void main(String args[]) {
		new Program();
	}
	public class SajatKomponens extends JComponent {
		public void paint(Graphics g) {
			Graphics2D g2 = (Graphics2D) g;
			
			g2.setColor(Color.blue);
			
			Line2D lin = new Line2D.Float(100, 100, 250, 260);
			g2.draw(lin);
		}
	}
}