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

public class StrokeTest1 extends JPanel{

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

    StrokeTest1 app = new StrokeTest1();
    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(50, 30, 240, 120));

    BasicStroke wideStroke = new BasicStroke(4.0f);
    g2.setStroke(wideStroke);

    g2.draw(new Line2D.Double(50, 50, 240, 140));

    BasicStroke superwideStroke = new BasicStroke(10.0f);
    g2.setStroke(superwideStroke);

    g2.draw(new Rectangle2D.Double(70, 20, 150, 120));
  }
}