JAVA 17 17 - プログラム倉庫

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 ex17 extends JPanel{

  public static void main(String[] args){
    JFrame frame = new JFrame();
    ex17 app = new ex17();
    frame.getContentPane().add(app);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(100, 100, 500, 500);
    frame.setTitle("ex17");
    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(100, 100, 300, 300));
  }
}