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

public class ShapeTest1 extends JPanel{

  public static void main(String[] args){
    JFrame frame = new JFrame();

    ShapeTest1 app = new ShapeTest1();
    frame.getContentPane().add(app);

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(10, 10, 300, 200);
    frame.setTitle("ƒ^ƒCƒgƒ‹");
    frame.setVisible(true);
  }

  public void paintComponent(Graphics g){
    Graphics2D g2 = (Graphics2D)g;

    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
                        RenderingHints.VALUE_ANTIALIAS_ON);
    g2.draw(new Line2D.Double(30.0d, 50.0d, 180.0d, 140.0d));

    g2.setPaint(Color.PINK);
    BasicStroke wideStroke = new BasicStroke(4.0f);
    g2.setStroke(wideStroke);
    g2.draw(new Line2D.Double(30.0d, 120.0d, 250.0d, 70.0d));
  }
}