import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.*;
 
class Hello extends JFrame {
    Hello( title ) {
        super( title );
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(640, 480);
 
        panel = new HelloPanel();
        add( panel );
    }
}
 
class HelloPanel extends JPanel {
    void paintComponent(Graphics g) {
        g2 = (Graphics2D)g;
        g.drawString("Hello, Java2D World!", 0, 16);
    }
}

frame = new Hello("Hello, World");
frame.setVisible(true);