import javax.swing.*;
import java.awt.Graphics;
import java.awt.Color;

public class Graphics2DTest1 extends JPanel{

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

    Graphics2DTest1 app = new Graphics2DTest1();
    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){
    g.setColor(Color.red);
    g.fillRect(40, 20, 200, 120);

    g.setColor(Color.blue);
    g.drawString("Hello Java2D", 10, 50);
  }
}